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Versions of the 9.75 Axle

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Old 08-20-2012, 07:22 AM
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Versions of the 9.75 Axle

I had a main rear outside axle bearing catostrophically fail on my while towing my race trailer to the races this weekend.

Luckily i noticed it before it got to bad.

Upon disasembly i noticed that the bearings have smaller diameter rollers than the bearings of my fathers 9.75 rear axle that i did a few months prior.

After going tot he parts store i confirmed that his 9.75 axle had heavier bearings and shafts in his 9.75 axle.

I got my axle from a junk yard a few years ago and swapped it in place of my 8.8. I didnt know there was a difference i the years so i didnt really care what year of 9.75 it was.

Turns out that the 97 9.75 axles are a little lighter duty than there counter part 98-03's. Smaller beairngs and axle shafts.

Can anybody confirm this?
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Old 08-20-2012, 01:29 PM
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RockAuto shows every F-150 9.75" axle using the same bearing from 1997-2012.

3.0370" OD, 1.7080" ID

EDIT: It appears that certain early 9.75" axles used 34 spline 8.8" axle shafts and tubes and bearings for whatever reason. Odd.
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Old 08-20-2012, 06:59 PM
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there was a post on here about 6 months ago where someone ran into the "small" bearing on a 97 model.
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Old 08-21-2012, 08:12 AM
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Ya thats my luck. I pick up a used 9.75 to replace my busted 8.8 and i get the first year of it that is light duty. Oh well.
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