How do I know my rear gear ratio?

Rotate the marked tire one revolution while counting how many times the driveshaft rotates. eg, If your driveshaft made 3 3/4 revolutions, that would determine a 3.73 gear ratio. If you get approximately 2 3/4 revolutions, you have a 2.76 gear ratio.

How do I find out my rear end gear ratio?

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.

Does VIN number tell gear ratio?

If you're wondering why we're doubting the VIN codes capability, you might want to know how to find gear ratio by VIN. The Vehicle Descriptor Section (VDS) of the VIN will carry information for the gearbox ratio if the specific manufacturer includes it.

Is gear ratio stamped on ring gear?

You can't find the stamping on the ring gear? Start counting! Count all the teeth on the pinion gear and the ring gear. Once you have those two numbers, divide the number of teeth that are on the ring gear by the number of teeth that are on the pinion gear and BAM–you have your gear ratio!

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

With the transmission in neutral, rotate the rear driveshaft by hand. Count the number of driveshaft revolutions required for one revolution of the tire. If the driveshaft turns approximately 3-1/2 times, you have a 3.54 ratio, etc.

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.

How do I identify my GM rear end?

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.

What gear ratio does my f150 have?

Write down the number in the lower left-hand corner of the tag. It will look like "3.23" or "3.50." This is the gear ratio. If there is an "L" in the number, for instance "3L23," it is a limited slip differential.

How do I identify my axle?

Stamped Number on the Axle

To figure out exactly what axle you have, you can look for the Dana stamped bill of materials number. This stamped number can usually be found on the righthand side or on the longer axletube on the same side of the tube as the differential cover, facing the rear of the truck.

How do I find the rear axle ratio on my F-150?

How Do I Find the Axle Ratio and Limited Slip of My Ford Vehicle?

1. Locate the Safety Compliance Certification Label on the driver's side front or rear door panel.
2. Find the word AXLE under the bar code.
3. Find the two-digit code under AXLE.

How do you tell what rear end I have in my F-150?

Locate the number immediately to the right of the axle ratio. It identifies the ring gear diameter, for example, "8.8." Write it down. This is how the rear axle is described: "8.8" would mean you have an "8.8" rear axle.

How can you tell the difference between an 8.2 and 8.5 rear end?

Another way to tell the difference between an 8.2 and an 8.5 rearend is to pull the cover and look at the bolt holding the spider gear crosspin. If it takes a 1/2-inch wrench to remove it, it's an 8.2. If it takes a 5/16-inch wrench to remove it, it's an 8.5.

How do I find the axle ratio on my Silverado?

To find the axle gear ratio of any GM vehicle, locate the RPO sticker (typically located in the glove box) and write down any codes starting with F, G, or H.

How do I identify my Ford rear differential?

The differential carrier tag contains the Dana model number and is located next to the driveshaft mount, facing forward on the passenger side of the housing. The model number is located on the top right hand corner of the tag, J210-S, for example. Locate the identification tag on Ford manufactured rear end units.

How do I know if I have a Ford 9 inch rear?

Many enthusiasts will tell you to look for the two dimples in the rear cover to determine if the unit is a 9-inch, but this is not always true. Ford also had an 8-inch third-member rear end that had a dimpled cover. The best test of a 9-inch carrier is to try removing the two lower carrier case bolts.

How do I know if I have 8.8 or 9.75 rear end?

While the Super 8.8's cover has a bulge for the ring gear, it's not anywhere near as pronounced as the 9.75's. Once you know what to look for, it's pretty simple to tell the two rear ends apart. You'll just have to throw on your reading glasses and take a look under your truck to figure out the difference.

How do I know if I have an 8.8 rear end?

Note the three sets of numbers across the bottom of the tag. The middle number will be "7.5" or "8.8." This is the size of the rear axle. If there is no tag on the differential, you can visually identify the axle another way.

What rear end do I have by VIN?

Identify the VDS section, the fourth through eighth digits of the VIN. This section typically includes information such as the vehicle model, engine size and body type. While not every vehicle manufacturer includes gearbox ratio information in the VDS, this will be where the information is found if it was included.

How do you find the gear ratio on a 2002 Ford F-150?

Open the front door on the driver's side. Locate the Truck Safety Compliance Certification Label on the door pillar near the door latch. Locate the two-digit code in the box labeled “AXLE,” which is just below the bar code. Match the code on the label to the corresponding rear axle ratio.

How do you measure a rear axle?

Using a measuring tape, measure from one flange to the other. To ensure an accurate measurement, always measure from end to end where the wheels bolt on to the axle.

How do I know what rear end my s10 is?

Look under the rear of the vehicle. The rear end is centrally located between the rear wheels. On the back of the unit, count the number of bolts holding the inspection plate cover to the rear end housing. All three units have 10 bolts, as they are all variations of the GM Corporate 10-Bolt.

How wide is a 4x4 S10 rear end?

54-3/8" wide from WMS-WMS (wheel mating surface) is what i've been told & the s10 4x4 are 60".

How do I identify a GM 10 Bolt differential?

The rear cover's shape and the number of bolts are identifying features for GM rear differentials. The round 10-bolt cover with a bulge for the ring gear identifies this axle assembly as an 8.5-inch 10-bolt. The two lugs on the lower case at the 5 and 7 o'clock positions are also identifying features.