Question: How can i tell what gear ratio my truck has?

Method 1: Count the number of teeth on the ring gear and the pinion. Divide the number of the ring gear’s teeth by the number of the pinion’s teeth. This will give you the axle ratio.

  • There’s no question, the easiest way to identify the axle and gear ratio in your truck is from the door sticker. If you open the drivers door and look at the door jamb, you’ll see a sticker like the one shown below: You’ll see that the area labeled (F) is for the Axle Code.

How do I find out what gear ratio My truck has?

How to Find Out the Gear Ratio With the VIN Number

  1. Find the VIN of your vehicle. It can be found on the sticker on the inside of the driver’s side door or on a stamped metal plate embedded in the dashboard above the steering wheel.
  2. Identify the VDS section, the fourth through eighth digits of the VIN.

Does VIN number tell gear ratio?

Each number and letter contained within a VIN reveals information about the vehicle, such as the make, model, production year and engine size. The VIN will not give you gear ratios in most cases.

How do I know what rear gear ratio I have?

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.

How do I find out what gear ratio my Chevy truck has?

Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box.

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How do I identify my differential?

Without an ID tag, differentials are identified by the number of cover bolts, the distinctive shape of the cover, the number of ring gear bolts, and ring gear diameter. They can also be identified by whether the center section is an integral or dropout design.

Is 3.42 or 3.73 better?

The 3.42 is fine for towing smaller boats, plus you will get better gas mileage for everyday driving. If I were towing frequently on hilly roads, I might would go for the 3.73 for better gas mileage while towing, but the 3.42 should be fine with a 205.

What does the 8th digit in a VIN number mean?

You can determine the RPO code if you have the Vehicle Identification Number (VIN) from the original vehicle. It’s the engine size! The eighth VIN digit (1) will describe engine information a little more in depth, like … It’s the third and final character that helps to identify the manufacturer and location of build.

What does each number in a vin mean?

Tweet. A Vehicle Identification Number (VIN) is a 17-digit code, comprised of capital letters and numbers, that uniquely identifies a vehicle. Each letter and number provide specific pieces of information about your vehicle including the year, make, model, engine size, and manufacturer.

How can I tell what gear ratio I have without pulling cover?

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.

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Is it better to have a higher or lower gear ratio?

A lower (taller) gear ratio provides a higher top speed, and a higher (shorter) gear ratio provides faster acceleration.. Besides the gears in the transmission, there is also a gear in the rear differential.

What gear ratio do I need for 33 inch tires?

Gear Ratio And Tire Size Calculator

3.31 5.13
33 2191 3395
34″ 2126 3295
35″ 2065 3201
36″ 2008 3112

What’s the best gear ratio for highway driving?

Rear end gears (2.79’s, 3.00’s, 3.25’s, etc) are great for freeway driving, bit not good for 0-60 MPH or accelerating from a dead stop. Shorter gears (higher numbers) are much better suited for accelerating, such as 3.55, 3.73, 3.91’s, 4.11’s etc. Always remember, for very “give” there is a “take”.

Can you change the gear ratio on a truck?

You can change the axle ratio, and you can do it rather easily. Quite a few members here have gone from one ratio to the next. People with 3.21 and 3.55s are going up to 3.92 and even sometimes 4.10. A lot of the 4×4 trucks you see here with lifts and larger tires have gone with 4.10 or 4.56.

How do I identify my GM differential?

Information about Differentials in GM vehicles can usually be obtained by looking at the RPO or “Regular Production Option” codes contained in the Service Parts Identification tag in the glovebox. Whenever possible, reference the tag numbers when ordering parts for your Differential.

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