TEN Factory by Motive Gear offers high performance front and rear axle shafts and axle kits. After a rear differential fluid change, most vehicles will go 20,000 to 40,000 miles before it’s due again. 56 axle ratios. Gear Ratios - 6" ring gear The 1990-93 1. A smaller engine will need a lower rear end to give adequate acceleration. It doesn't seem to be very good for highway driving though. com is the most important platform for Golf cart rear axle product online whole sales, most of the golden suppliers on the platform comes from China, Shandong, Jiangsu in China(Main Land), they produce qualified Golf cart rear axle Golf cart rear axle with certifications as ul, vde, ce, ccc or rohs and support OEM and customized designs. 875 after market set. Car is meant for the street , cruising around, driving to work on the highway, etc. 21 in 7th gear. General Truck parts has been the prime source for thousands of new and remanufactured heavy duty and mid-sized truck parts. Here’s a great little TJ gear chart to find out what gear ratio would be good for you if you are changing tire sizes. 08:1 ratio (G91) Highway driving gear ratio. What gear ratio should the rear end have for the best all around performance. 3636, then our drive ratio (DR) is 5. 56 RATIO Is this just a standard "open" differential, versus limited slip or posi-traction? I've seen a lot of discussion about different gear ratios, limited slip, and posi rear ends that have been in the RM and its sister models. I was thinking of sometheing around 3. For highway cruising and best fuel economy stay towards the yellow (2600 rpm), around town daily driving is color coded green (2800 rpm), and for better towing power or just more 4-low power use the ratios near the red (3100 rpm). 2 drink the gas around town. 50:1 range is great for a dual purpose car. You plan on moving up to 38". The height of your rear tires can effectively change the ratio of your rear end gears. 6 speed to buy and what rear end to switch to. On 16 December 2009, Juan Gil Gutierrez in France wrote: >>"As I had a 4. If I didn't have a lockup converter I would be constantly slipping with my converter on the highway. Remanufactured rear differential assembly. 8" Reverse IFS and adjust your truck's final drive ratio for improved power or to get rid of sloppy shifting and sluggish driving that's caused by throwing larger wheels and tires. I heard figures that you can gain 4% better fuel economy with a direct top gear since you're not spinning through a set of gears. compare to this photo taken a month earlier: I will take it into Pacific Corvette and they will tell me for sure. 38 ratio will act a lot like 31 inch tires with a 3. JK Gear Ratio's. 23 revolutions for every revolution of the transmission. Find your transmission's first gear ratio (or your transmission model) in the heading of one of the three Torque-arm Rating Tables below. No matter what you install in your RC car or truck, when it comes to speed and run time it’s all about gearing. I am a fan of using the rear gear ratio and not the trans ratio to keep the car in power range and inversely if street driven cruising range, so a compromise is usually the case. Here's a quick rundown of the ratios available for the 4-speeds and 5-speeds that easily fit the 2002. There is an adjustment for pinion depth to set gear backlash and bearing preload using shims, but thsi is not for wear compensation, only for new setup. 73 are going to drive you crazy. 55 to one, 3. Although there are various factors involved in the deployment of an airbag, it’s commonly understood airbags deploy at speeds of 20 miles per hour and higher. 17:1, depending on the truck class, make and model, and rear-axle capacity. Mixed driving -- 3. This was done to permit using a rear end ratio to give a specific area of driving some good performance for the particular combination of engine, weight, etc. com FREE DELIVERY possible on eligible purchases. This 12-speed, two-pedal transmission not only delivers smooth shifts every time, but also maximizes driver comfort, payload and fuel economy. Adjusting the Final Drive ratio impacts acceleration and top speed. 90 Shelby® GT500® Unique Features 7 2014 05+ Mustang (197) Supplement, 1st Printing, December 2012 USA (fus). 62 13 X 48 3. HiI was hoping to get some opinions from you all when it comes to Muncie transmissions and rear end gear ratios. 55 gears and affects on high end accleration? some highway driving can tell you that. For maximum towing, Ram Powertrain engineers gave the Ram 3500 an improved Dual‐Rear‐Wheel axle with a 4. How to Determine Gear Ratio. When ever you change tire size from the original size to another there will be a direct effect on power and drivability. There pretty much was an equivalent to a 3:31 available back then. 2, the third gear has the same torque as the. When building a car or truck for racing or street use this handy Potential Speed Calculator will help you to decide whether to use an overdrive transmission or not and which tire diameter to choose and what rear end gear ratio to pick by telling you what the potential speed of the application will be at a particular engine rpm when you are done. Moving up to Class 6 and 7 trucks (up to 26,000 lbs. I am looking for ideas on a gear ratio for my 69 2wd truck. tells me from the looks and the way it feels driving it, that my rear end is going, (slowly). I would like to lower the gear ratio for more off the line response. 85 13 X 51 3. Numbers are good but gear ratios on paper are nowhere close to realistic when you actually drive the Jeep with all the variables the world throws at it. However, you might have to change the rear axle ratio to a lower gearing for the truck to pull well while in overdrive. I also do a decent amount of highway driving, and my Jeep is also my daily driver. 40 ratio stock 12 bolt to swap with the 12 bolt you have now might not be too hard and it's much easier to swap rear ends for a novice mechanic than to swap gears, IMO. At 65 mph, this translates to 1886 rpm for the 3. I will recommend Arizona Differential Specialists to all of my friends and family. Without the lower gears your Silverado would be laboring even at highway speeds. I am getting ready to put a new GM 10 bolt rear end in my MCSS and I have come to a crossroad in determining whether or not to put in 3. compare to this photo taken a month earlier: I will take it into Pacific Corvette and they will tell me for sure. Right now same rear and trany (TH400) and stall behind a 360 280H cam it runs 13. They are simply too long. So, for instance, a 4. No matter what you install in your RC car or truck, when it comes to speed and run time it’s all about gearing. I know that the 3. Lots of folks get get stuck on the rear axle ratios, myself included but that was before we had 6 to 10 speed automatics. How To Select Proper Rear-End / Differential Gear Ratio May 7, 2015 Roadkill Customs How To & DIY A number of factors must be considered when selecting a rear-end gear ratio (ring & pinion set). I went for the 4:10 because that was the color combination I wanted in the vehicle. SUVs and other non-pickup tow rigs cannot escape scrutiny. 25's, etc) are great for freeway driving, bit not good for 0-60 MPH or accelerating from a dead stop. hypoid gear oil and reinstall the cotter pin securing the axle half shaft nut. 60:1 - Super highway economy. 5” 10-bolt is actually just as strong as a 12-bolt or Ford 9-inch rear, with only a fraction of an inch difference in the ring-gear diameter. 73's in an F250 should be plenty only hauling 4k lbs. The charts I found ranged from very good to bad. I have a 69 sportroof with a FMX Auto 3 speed with a 300. Carriers and gear sets are interchangeable between the two different versions (and also happen to be the same as used in the 2wd Toyota pickup 7. 55 ratio for cruising would be a better match but Im going to stick with 3. Not all gear ratios are available so you have the choice between 4. RANDYS has the widest aftermarket drivetrain selection. 30:1 ratio - that's it for the 6" ring gear size, theres no known alternative ratios that came out of the Mazda factory however the was apparently a 4. When working on a DANA unit, you can get the seals from Jaguar, bearings from a local bearing house, and the clutches, shims, and those silly little clutch retainers from any performance shop that has access to Dana rear end parts. A rebuilt axle assembly is a used axle or core rear axle assembly that has been taken down to a bare housing and had all of the internal parts replaced. However, you might have to change the rear axle ratio to a lower gearing for the truck to pull well while in overdrive. 727:1 (5 A/T) and 3. The advantage is that GM can build a vehicle with a higher rear gear ratio, while maintaining great acceleration due to the transmission's first gear ratio and achieve close ratios between gears for maximum performance while gaining a good cruising RPM. I haven't done anything to the rear end yet, but will by spring with a little luck. Tip: It's best to seek out the help of an experienced professional when changing the rearend gears. In other words, if the drive shaft turns 3 ¾ turns, you probably have a 3. He proceeds by saying his RPM is way too high and that he hits 3000 RPM at 55 mph. Go Kart Rear Axle. The drive axles associated with an open differential are interconnected by a bevel gear set designed to divide equal torque between drive axles. I already changed a 4-speed gearbox to a 5-speed, decreasing the engine speed from about 5000 rpm at 80 kph to the current 3500 rpm at 100 kph. 64 rear end will give you roughly the same cruise RPM's as a 3. Therefore, the higher the ratio (4. 0's and 6000 rpm at the line. There pretty much was an equivalent to a 3:31 available back then. Some people trash talk the GM 10-bolt as a junk rear end, and if they are talking about the 8. I'd probably go with the 3. Description: Mazdaspeed LSD 4. For example, if a guy has a big four wheeler and gets maybe 35-38" mud tires on it, he may have to drop to a 4. When it comes to remanufacturing differentials and rear axle assemblies, JASPER sets the standard, adhering to the measured standards of the original equipment manufacturer. Because different transmission gear ratios can greatly affect a drivetrain combination, it's important for anyone performing a transmission swap to know the gear ratios of the gearboxes you might be installing in your vehicle. “It’s a light-weight, durable and low-cost suspension,” he notes. I first discovered the rear axle on my truck is a Timken in August of 1996 when I was working on the rear brakes. 92 13 X 52 4 13 X 53 4. When you shift into 5th gear, your RPM’s drop from 1,500 to 1,000 and you have to start picking them up again. But in the '60's, gas mileage wasn't a concern. What can I do OTHER than change the rear end gears to drive on the highway, like everything that I have read says that 4:11's suck on the highway, and you really want like 373 or 342's if the car is going to be going that far. I lean towards 3:54 gears at 455hp. 88's on any tire size besides stock. 73 rear gear and a 28" tire 2500 rpm is about 80 m. 8 mpg in town. 20 Muncie I had. 0 is good for both but still a little. 73 and 5spd, not less. Reassembly should be straightforward, but don’t forget to bleed the brakes, replenish the rear axle assembly with 90 wt. 73 would provide better highway gas mileage (possibly even up to 23-25mpg). Choosing the Right Differential for Your Strip Burner January 16, 2015 Mike Aguilar Drag Race 101 , How-To and Tech Tips , Transmission and Clutch 1 We've gone through engine sizes and mods for your strip burner. 73 times to the wheels turning one, full rotation. I would not recommend a 200-4R for this application as it works best with a low rear gear ratio," Zack told me. Best Semi Truck Axle Ratio The drive axles impact a truck's ability to pull heavy loads, the speeds it can travel at, the overall fuel usage, and conclusively the company's bottom line. 225S10 differential replaces the conventional differential internals used in certain 1973 - present GM axles. At 65 mph, this translates to 1886 rpm for the 3. Blasting down fire roads and highway driving requires big power to get you going. 73 would be a low numerical ratio but a high mechanical one. 50:1 rear gear is a good all-around ratio but engine RPMs will be fairly high at highway speeds. 90 would have been ideal. Rear Axles & Hubs. I think in concept a 3. Good meeting you too fella, definitely a tidy spot for breakfast in the new year. How much do you plan on driving on the street, I have a similar setup,68 charger 440, 727, etc. I also do a decent amount of highway driving, and my Jeep is also my daily driver. 45 axle ratio. This also depends on the current rear gear. I couldn't imagine driving a car with a M-20 and a 3. Axle Model and get Free Shipping on Orders Over $99 at Summit Racing!. Enter your values on the left side, press Compute and your answer will be on the right. The overall gearing of the standard Corvette wide-ratio 4-speed combined with a 3. The Ford F-150 was introduced in 1975. So if you have a 3. 1997 Chevy Tahoe, with a front carrier with a 3. 10 gears compared to 3. After putting in a 3. 40 ratio and put that rear end. 10 ratio GU5 Rear axle, 3. It is a very important issue in terms of both highway and off road performance. What factory rear gear ratios were offered for this truck and does this rear end have a specific name? It has a 307 w/th350 transmission. Understanding rear gear ratios. What this means is that my truck hauls arse up until about 35-40 miles per hour. I saw someone recommended changing the gears in the rear end. Re: What rear gear ratio is good for highway??? To check the ratio, I jack up only 1 rear tire and have a friend spin it 20 times. 06:1 gear ratio in 1st gear. This equates to a greater amount of power transferred to the wheels. 73's are great all around gears for a 5 speed car, imo, my friend has them in. If the gear oil runs low or becomes excessively dirty, it can cause the gears to whine or howl as they turn. Having a locking rear differential in this. Square Outer Rear Axle Seal for Dana differential on 1993 and newer Columbia Par Car electric Burden Carriers +++ 2005 and newer Cushman Industrial models 875, Titan and Personnel Carrier with Dana differential. But with my newer AOD transmission, it wouldn't kill me to go a little higher on the gear ratio. 95 first gear). Secondary Gear Reduction Ratio: to 1 (If you are not sure what this is, make it 1. transmission accomplishes this task by providing a variety of gear ratios between the engine crankshaft and the output axle of the vehicle. Reassembly should be straightforward, but don’t forget to bleed the brakes, replenish the rear axle assembly with 90 wt. However, you can run your truck in direct gear if you install 2. What this means is that my truck hauls arse up until about 35-40 miles per hour. 36 '67 feels like it needs another gear out on the open road. 6 rear end was offered only in a 4. I bought a 8" rear out of a 66 and the gears looked pretty good and I got a rebuild kit and a friend is now rebuilding it and he has done a ton of these things and suggusted I get a new ring and pinion gear set while I am here just cause he cant warranty anything with it being the old gears. Red = Best Power, this will give you the best performance for towing power, but at the expense of your MPG. The rear wheel drive Toyota Corolla was first introduced in Japan in model year 1966. So it's the stock rear end for now. After searching and talking to the people I came upon the understanding that nothing seemed to match. The first step is to remove the differential from the axle housing. Once the vehicle was broken in, did several mileage runs at different constant speeds. Therefore, the higher the ratio (4. 55 and keep it strictly track. 06:1 gear ratio in 1st gear. Gear Ratio and Tire Size Chart NEXT PAGE This gear ratio and tire diameter chart is meant to give you an approximation of ideal RPMs at highway speed (65 mph) for three situations: fuel economy, every day driving and increased towing power. 8 inch solid rear axle with standard limited-slip differential and optional TORSEN® differential, 3. 11 gear set becomes 2. If you ever think you might go heavier if you have the option get the 4. 43 teeth on the ring gear and 8 on the pinion. 17:1, depending on the truck class, make and model, and rear-axle capacity. Shifting at 5000rpm from 3rd gear into 4th (76mph), sees engine speed drop by almost 1500rpm, to a little over 3500rpm. How to set up and ride a fixed-gear bicycle for road use. I get between 10-12 towing my 16,000 pound trailer with my '10 Ram 3500 DRW. When you increase the tire size without changing the gear ratio you increase fuel consumption and you can not drive at the low speeds needed for the off roads. 73 gear ratio reared on a 347 stroker?. Gear Ratio Calculator please send the information to me at [email protected]
12:1 rear axle, your RPMS would have went up at highway speeds. I like it much better with the slower engine rpms and quieter exhaust. I'm loosing approx. Generally utilized in combination with 4-speed transmission. 73 and 5spd, not less. Change the gear ratio in your car according to your comfort or performance preference. Learning what gear ratio is and how to calculate for it can help you build a high-performance car. The disc-brake system uses ventilated 12. The higher the gear ratio, the quicker your car will accelerate. 42:1 w/TH350 but now 3. 73:1 gears at 4,400 rpm. I know that the 3. Best Regards, Mike. This unit is backed with our 3 year unlimited mileage parts & labor nationwide warranty. Not much free way driving. 73 revolutions for each rotation of the rear wheels (or ring gear in the axle). 13 to 1, help to get the car moving. There were 129K miles on the truck it was removed from. The cause and effect of the front and rear sprocket. This was done to permit using a rear end ratio to give a specific area of driving some good performance for the particular combination of engine, weight, etc. IIRC, final drive ratio of the 3. 8mpg with that truck. (Especially because I've been tolerating 3. 73:1 axle/gear ratio means the drive shaft (or pinion gear at the end of the drive shaft) rotates 3. This calculation is used to match oversize tires with new ring and pinion gears to obtain the desired engine RPM at highway speed. TEN Factory by Motive Gear offers high performance front and rear axle shafts and axle kits. The final drive ratio is the ratio of the number of teeth on the ring gear to the number of teeth on the pinion gear, and it's stamped on the final drive unit near the driveshaft oil filler hole. 10 Gear ratio like my truck but with that gear ratio if you go over 55 mph you can say goodbye to your gas mileage so get a smaller gear ratio. 17:1, depending on the truck class, make and model, and rear-axle capacity. The owners manual has this listed. My father's black beast and my red XR4 both have Hanlon built T-5's with 2. My older brother ran that ratio in a 69 Mach 1 with a 351W and FMX trans way back in high school. BUT if I really wanted to get on the highway from time to time how horrible would the cruising speed/gear shifting be with 3. 5" axle when a Ford 10. The rear wheel drive Toyota Corolla was first introduced in Japan in model year 1966. Hey all, I was wondering if anyone could tell me what the standard rear-end and gear ratio was on a 1972 Dodge Charger SE with a 400ci 2bbl. Generally utilized in combination with 4-speed transmission. Gears, axles, locker, limited slip, kits, driveshafts, transfer cases and more. Axle Model and get Free Shipping on Orders Over $99 at Summit Racing!. Rebuilt Rear Axle Assembly When purchasing a rebuilt axle assembly, it is important to note there are differences between a rebuilt axle, reconditioned rear axle and a repaired rear axle. The dealer can put it all into his computer and figure out where to gear it for you and you can always have the pumpkins changed later if things change its a little expensive but it can be done pretty easy. The Top 10 Off-Road Transmissions of ALL Time. 4) Real world vs. 2 x 267-130 – Pinion Gear Thrust Washers. Then I found a 70's-era 12 bolt with a 3. 261351 Highway 101 Sequim, Washington 98382. 73 gear ratio. I am looking for ideas on a gear ratio for my 69 2wd truck. The height of your rear tires can effectively change the ratio of your rear end gears. 0's and 6000 rpm at the line. Simple guide to choosing the best diff gear ratios for your Jeep or 4x4 truck The correct chart for your gear ratio is important for drivability and economy. If you ever think you might go heavier if you have the option get the 4. Parts ship same day!. The HUMMER H2 combines class-leading Vortec power with a durable four-speed automatic transmission and a sophisticated four-wheel-drive system to stake its claim to being a true go-anywhere vehicle. 3-inch/rear rotors. If it was good enough for Ford to use 3. ON SALE! Summer Sale Now On!! $ 2,699. Ford Ranchero, Falcon, Fairlane, Galaxie, Torino And Mercury Comet, Montego Car Parts And Accessories For The Restoration Of Your Classic Ford Or Mercury Car. I haven't opened the rear axle yet, but I would assume that it will need new bearings and possibly gears. Next, Dual Rear Wheel (DRW) F-350 and F-450's are bumped to a Dana M300 with a massive 11. Differential Ratio Selection: Here is a quick guide to help you decide which differential ratio will best suit your needs based on an automatic, 3 or 4spd transmission please be advised that this is a guide only and is to be taken and used at face value 2. There was a tag on it that had "322" on it. 27 which were much better gear for street use. i was thinking a 3:45 LSD diff would suit alright? ive done some looking around and cannot figure out what i would be better off with. Pull up an RPM calculator, figure out the end gear ratio of your c4 (probably 1:1 but I'm not sure) and then toy around with tire size and gear ratios until you find the right combo that works for you. 80:1 fifths. How The Overdrive Transmission Affects Rear-end Ratios… All B-W overdrive transmissions function at a 0. A regular V6 with the automatic did it in 6. If highway gas mileage is a major concern, a good compromise is a lower ratio such as 3. rear gear ratios 3:73 vs 4. GVWR), drive-axle ratio options increase substantially, depending on the manufacturer. That puts me in the 2500 to 3000 range on the highway. Get a road speed calculator and play "what if" games on it with various combinations of rear end ratios and transmission ratios and find what would work best for your particular operation. Unfortunately, the parts database just showed parts numbers, it didn't show the actual ratios, so I don't know the ratio of the other, "mystery" Outback 5th gear. General Truck parts has been the prime source for thousands of new and remanufactured heavy duty and mid-sized truck parts. we get a new gear ratio of 5. If you've ever driven a C7Z, you'll notice that the gear spread is perfect, it just needs a slightly lower axle ratio. This also depends on the current rear gear. 50:1 range is great for a dual purpose car. 22 listed in the axle chart. Re: What rear gear ratio is good for highway??? To check the ratio, I jack up only 1 rear tire and have a friend spin it 20 times. For a cable driven speedometer to be accurate, it requires the correct combination of 4 different things - DRIVE GEAR, DRIVEN GEAR, TIRE DIAMETER and REAR END RATIO. I tried my best to be as smooth as possible while driving for 2 reasons,1- he was an older fellow who had experience and i wanted to. My top 5 reasons why I chose a 3. Three questions sometimes arise when considering a change in rear end ratio: How will the change affect top speed?, How will the change affect fuel economy?, and How will the change affect exhaust emissions?. Over the years, the F-150 came with an assortment of rear ends and gear ratios depending on engine size and options. 73 should do the job. The set up of a gear set can be accomplished by first measuring the carrier pinion. Rotate the tire one full revolution for posis and lockers and 2 full revolutions for open diffs. With a stockish 5. Truth be known, even with an axle ratio designed for towing your fuel economy doesn't suffer much in normal stop and go type driving just because of the axle ratio. Unfortunately, about halfway through 3 rd gear, it flattens out and has nothing left (because 4 th gear acts as an overdrive with no oomph). Reason i ask is that most literature recommends a 4. 66 Second 2. 55 are the best ratios for getting good mileageand which of those you choose depends on the conditions you drive in. Axle ratio can be used in reference to either the front or rear axles, depending on if the vehicle is front wheel drive, rear wheel drive, all-wheel drive, or four-wheel drive. Times and requirements have changed making both the M21 and M22 the closest ratio production 4 speeds ever produced but also not practical for today's driving habits unless road racing is your thing. How to Choose Your Axle Gear Ratio - Duration: Best Half-Ton Towing Truck!. Ford F-150 owners have reported 77 problems related to differential unit (under the power train category). What is the STANDARD gear ratio for the rear differential in all these lines? I know that within Group 19 parts you had the option of five different gear ratios: 3. A smaller engine will need a lower rear end to give adequate acceleration. The ST-10 with 2. CHOOSING GEAR RATIOS For Best Performance - CF-301. How to Choose Your Axle Gear Ratio - Duration: Best Half-Ton Towing Truck!. 92 back to back and it wasn't a big difference. I think you'll be surprised at what a difference it makes in fuel economy on the highway. 0's and 6000 rpm at the line. The gear ratio I had was a 3. 00:1, at least in the 1968-1974 Javelins and AMXs, I don't know if they were available in the Rebel Machine, Hornet SC/360 or any other line. for instance if your engine turns 2500rpm and you have a 1 to 1 high gear in transmission with a 4. Evolution, not revolution, is the name of the game, but the 70 Series has now become much more complex, Allan Whiting from Outback Travel Australia reports. 68 are good for. 42 Rear End Gears. Description: Mazdaspeed LSD 4. I have a three speed transmission and I can now cruise at a easy 55-60 and second is still low enough to make it up a steep hill. 5:1 will make the engine very busy at highway speed, anything less will slow launch capability. Your vehicle's gear ratio can determine its top speed, how quickly it can get to that top speed, and how hard it has to work doing so. 6 speed to buy and what rear end to switch to. 50 Reverse 2. The lockup converter allows me to have a high stall and cruise on the highway. For example 27 inch tires with a 3. The faster you go the louder it gets. With a ratio of 4. One higher ratio (lower gearing) would be useful for town or mountain driving and the lower ratio (higher gearing) for flat highway driving. No matter what you install in your RC car or truck, when it comes to speed and run time it’s all about gearing. This is the strongest rear made by Mazda for your miata. 07 with 33" tires so far - and been saving up for this gear/axle upgrade. The Gear Centre Off-Highway Division is a ZF Service Partner for all of your ZF on-highway and off-highway applications. If the transmission gear ratio is: 1. The advantage is that GM can build a vehicle with a higher rear gear ratio, while maintaining great acceleration due to the transmission's first gear ratio and achieve close ratios between gears for maximum performance while gaining a good cruising RPM. Does any one have any back on the gas mileage for the above configurations. 10 is the easiest/cheapest for me to run with (due to them already being installed in the axles), and I think it wouldn't be too bad with 35" tires. Rear Axle & Front Wheel Bearing plus Steering. Differential gear, in automotive mechanics, gear arrangement that permits power from the engine to be transmitted to a pair of driving wheels, dividing the force equally between them but permitting them to follow paths of different lengths, as when turning a corner or traversing an uneven road. I also do a decent amount of highway driving, and my Jeep is also my daily driver. Plug in the tire size, speed, rpms, and other info - leaving out whatever you're trying to determine - and it will come up with your answer!!!! I used to build rat rods and depended on this website to tell me what gear ratio I needed for the tires I was going to use. I have a 1983 Jeep CJ7 258 6 cyl, 4sp manual dana 30 front axle/amc 20 rear. It's mostly a highway truck, so went with the higher gears at the time. 10s are common gear choices. Be prepared to lose some umphh going to 3:08. 73 won't tow as much as the 4. The rear axle ratio should be at the top of the list, no matter what you are going to use your pickup for. Mathematically, 16 times 2. Therefore, the higher the ratio (4. The Torsen differential also makes the 4Runner less prone to slippage caused by sudden changes in road conditions, such as driving through a puddle or ice patch. 73:1 gear ratio the drive shaft turns 3. Primary Gear Reduction Ratio: to 1 (If you are not sure what this is, make it 1. that's only half the equation. For example, aerodynamic drag from the truck's frontal area, weather conditions, and driving habits—not the gear ratio—are all major contributing factors in a vehicle's fuel economy. Do they match the final gear in the tranny (although being a 10 speed I don't know if it would just be the 10th gear???) to the diff ratio, so that regardless of which diff ratio you choose, the final drive ratio. It isn't that the 3. - A mechanical reverse box such as the Elite reversing box fitted as a jack-shaft arrangement between the gearbox and the differential. If it was good enough for Ford to use 3. Most cars do not have it. 42:1 w/TH350 but now 3.