How to Do I Find Out My Rear Gear Ratio in My Truck UPDATED

How to Do I Find Out My Rear Gear Ratio in My Truck

HOW TO DETERMINE YOUR GEAR RATIO

Knowing your rear terminate'due south gear ratio is crucial when you are considering a transmission upgrade, needing to calibrate the speedometer gear in your transmission, selecting the proper gear sets in a transmission, or fifty-fifty getting professional person assistance with a new axle ratio for your application.

There are ways to determine your gear ratio without having to open up your differential.

The differential as well chosen a pumpkin, is a mess if y'all open information technology up.
The gear oil is smelly, it takes a lot of fourth dimension, and you want to avert opening it upwards if possible.

And then, at that place are some places you can check and things yous tin do to determine your gear ratio without going through all that.

Check the Differential Comprehend

In that location are two other places that you can cheque…On the Axle and the differential cover itself

The beam may have a sticker, and on the differential cover, yous might have a small-scale metal tag that'due south sticking out that will take the gear ratio stamped on it.

Click this link for some assist with reading Tags

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Do a Driveshaft Plow Test.

Before you can brainstorm identifying the gear ratio, you will also demand to know if the rear end is a "posi" or open differential.
This is required because identifying gear ratios is a niggling unlike for each unit.

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To brainstorm with, enhance the rear of the car with a floor jack and identify a practiced prepare of jack stands nether the car on the frame or rear-axle housing.
Once supported, identify the manual in Neutral and turn one of the rear wheels.

• If the opposing bike spins in the aforementioned direction, you take a posi – or express-slip – differential.
  If this is the case, y'all can get out both jack stands under the automobile.
• If y'all spin one of the rear wheels and the other one rotates in the contrary direction, you take an open differential.
  In this example, you volition need to remove one of the jack stands and put one tire back on the ground.
  

While doing this test, some guys like to apply soapstone, chalk, or tape to put a mark on the tire and driveshaft to brand counting the total revolutions easier. If you likewise want to practise that, a modeler's paint marking besides works well. I typically focus on an already supplied marking of some sort on the tire (like a certain letter of the alphabet of the tire'south name) and ane of the universal-joint bolts and use those every bit your reference. If using a paint marker, make a large, visible dot on both the inside of the tire and on the driveshaft.
(we used tape)

When you have your marks applied, if the car has a posi unit, both tires will be in the air.
Rotate the marked tire one revolution while counting how many times the driveshaft rotates.

eg, If your driveshaft fabricated three iii/four revolutions, that would decide a 3.73 gear ratio.
If you get approximately 2 3/iv revolutions, you lot take a 2.76 gear ratio.

Like previously mentioned, if your machine has an open differential (non-positraction), you volition want to perform the bank check with one rear wheel on the ground. Once more, marker the inside of the tire and a spot on the driveshaft with your pigment marker. At present, rotate the suspended tire ii revolutions and count the number of driveshaft turns. The reason to make two revolutions is the open differential actually rotates half every bit many times equally a 'posi,' because of the design of the "open" gear performance.

if the driveshaft turned 3 3/4 revolutions for two rotations of the tire, you lot take a 3.73 gear. A driveshaft that rotates 2 three/iv times announces a ii.76 gear ratio.

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Check the Ring Gear Stamping
If you have admission to the differential and the cover is already removed look on the ring gear plow it until yous can meet the stamping, you'll run across the number of teeth.
That is the number of teeth for the ring gear and the pinion gear.

If y'all are not sure about your results when using the wheel rotation method, the number of teeth is stamped on the ring gear. The small number is the pinion-gear molar count. The large number is the ring-gear tooth count. To find the gear ratio, dissever the big number by the little number.
In the example to the left, 37 ÷ 12 = 3.083333. These are 3.08 gears.

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Calculate the Ring & Pinion Teeth

If yous tin can't observe a stamping or information technology is unreadable.

So you can always count all the teeth on the pinion & band gears.
Once you have those 2 numbers divide the number of teeth from the ring gear by the number of teeth that are on the pinion gear.
The answer will be your gear ratio.

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Hopefully, we have provided you with some cognition that every machine guy should know & will help with any decisions nigh changing gears a little less challenging.

If you have any questions as always we are here to assistance

call:    PH – 208-453-9800        OR      email the states at:      info@moderndriveline.com

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How to Do I Find Out My Rear Gear Ratio in My Truck UPDATED

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