Rearend gear ratio - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 02-08-2007, 09:44 AM Thread Starter
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Rearend gear ratio

Sorry guys but how do you go about finding the Rearend gear ratio? 97 7.3 PSD
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post #2 of 11 Old 02-08-2007, 09:51 AM
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Quote:
Originally Posted by Chad T View Post
Sorry guys but how do you go about finding the Rearend gear ratio? 97 7.3 PSD

Unless it has been removed or broken off there should be a tag on the diff that tells you the gear ratio. If not you can go to a dealer and they should be able to run the vin number and tell you what gear ratio you have.


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post #3 of 11 Old 02-08-2007, 10:07 AM
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Another good way is to jack the back wheels up. Mark the driveshaft and the inside of the one of the wheels. See how many times the driveshaft turns to get the tire to turn one complete revolution. Example: if driveshaft turns just a little more than 4 turns to the tires one turn..you've got 4:11's...3.7 turns?..3.73's...3.5 turns? ..3:55's.

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post #4 of 11 Old 02-08-2007, 12:33 PM
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Look at the sticker in the driver side door jamb. Under axle it will have a 2 dig. code. Let me know what it is and I will look it up.

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post #5 of 11 Old 02-08-2007, 03:18 PM
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its probably 3.55 thats what mine is.
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post #6 of 11 Old 02-08-2007, 04:35 PM
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above methods work let us know.

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post #7 of 11 Old 02-08-2007, 07:48 PM
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pipelayrjdh, do you know what a C9 axle code is? That's what I've got on mine.

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post #8 of 11 Old 02-09-2007, 11:05 AM
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3.55:1

6,250 lbs. capacity w/ limited slip

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post #9 of 11 Old 06-22-2007, 12:56 PM
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I'm looking at buying an 89 F350 parts truck and the guy said the axle code is 39. What would that be? I thought the first number in the code was always a letter?
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post #10 of 11 Old 06-22-2007, 01:08 PM
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Quote:
Originally Posted by Tony1784 View Post
I'm looking at buying an 89 F350 parts truck and the guy said the axle code is 39. What would that be? I thought the first number in the code was always a letter?
39 Conventional non-Positraction Differential 3.55

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