Do vehicles have different axle ratios?

Do vehicles have different axle ratios?

Axle ratios vary widely from truck to truck. Front- or rear-wheel-drive trucks tend to include different ratios for the rear and front axle, while four-wheel-drive vehicles typically have similar front and rear axle ratios.

How do I know what gear ratio my rear differential is?

Turn the wheel TWO revolutions and count the number of driveshaft turns. The number of driveshaft rotations will help you determine your rear axle ratio. For example, if it turned 3 and a half times, it’s a 3.50:1 ratio. If it turned 4 and a quarter times, it’s a 4.25:1 ratio.

What is the difference between 3.21 and 3.92 rear axle ratio?

From the speed 31-38 MPH, 3.21 has higher final drive ratio over 3.92 (15.12 vs 12.31) until it has to shift to 2nd gear at 38MPH. From the speed 39-47 MPH, 3.92 has higher final drive ratio over 3.21 (12.31 vs 10.10) until it has to shift to 3rd gear at 47 MPH.

What rear axle ratio is best for fuel economy?

The most popular rear end ratio in trucks today is the 3:55, which sort of averages towing power and fuel economy. This is a good ratio for the occasional towing or hauling individual. For a person who tows more often, and heavier loads, the 3:73 or 4:10 may be more appropriate.

How do I know my diff ratio?

So an easy way to determine your actual gear ratio is to check the tag attached to the differential cover by the cover bolts. On the tag there should be some numbering such as 3.54 or 3.73, either of those numbers will give you the stock axle ratio.

Do front and rear diff gears have to match?

Final drive ratios must be the same. A diff doesn’t have a ratio and is always the same, ie, One wheel stopped, the other side twice the speed. All diffs are the same. Any difference in final drive ratios front to rear will cause failure unless a centre diff is running the DIFFERENCE of speeds.

What’s the difference between manual and auto axle ratios?

The top ratios between manual and auto are only a few percent different, so not the source of any measurable fuel economy difference. Putting a 3.7 into the auto would likely decrease highway economy as the RPM would be higher with corresponding higher pumping losses.

What should the gear ratio be on a GU2?

GU2 – 2.73’s Standard auto trans gear ratio. also note on the A4’s (auto’s) shifter console if the gear selector for 1 is missing. I don’t remember if they were 3.42’s then or 3.23’s. Nonetheless even with a LT1 and whatever gear ratio you should still be getting to 60 in less than 6.

What happens if you upgrade your axle ratio?

Some automakers let you upgrade your axle ratio for this reason, giving you better initial acceleration as well. Keep in mind, however, that your top speed and fuel economy may suffer if you upgrade, making it costlier to pull trailers or carry heavy-duty cargo in the rear end of the vehicle.

What’s the difference between tall gears and short gears?

When considering axle ratios, keep in mind differences in terminology. “Tall gears” refer to numerically lower axle ratios, whereas “short gears” refer to numerically higher ones. There are several other things to consider when picking an axle ratio.