Ujoint question

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Sep 7, 2021 | 07:11 PM

K5BEAST

Thread Starter

5th Wheeling

Joined: Dec 2017

Posts: 42

Likes: 6

Ujoint question

99 f250 super duty. Rear shaft, rear joint. Felt like i had a bad u joint the other day so i crawled under and looked. It appeared that the rear joint was bad as there was slop. I pulled the shaft and the joint was fine. Turns out that the distance between the 2 tabs that locate the joint measures 3.695 compared to the 3.625 of the joint. Is this normal? Seems like a lot of lateral movement to be. Any fixes short of replacing the pinion? I thought about adding a .030 shim inside each of the two caps but not sure how well that would hold up.

Sep 8, 2021 | 03:44 AM

Just Strokin

Post Fiend

Joined: Nov 2001

Posts: 6,748

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From: Tallassee, ALabama

Maybe someone replaced the u joint with wrong one? I would take my calipers and go to local parts store and have them pull one you can the width and compare it to yours. It is i the wide width, I would replace the u joint.

Sep 8, 2021 | 09:03 AM

99powerstrokedF250

Logistics Pro

Joined: Jan 2010

Posts: 4,153

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Definitely sounds like someone used the wrong joint when it was replaced previously. It was either done by a shadetree mechanic or a shop that didn't know what they were doing.

Sep 8, 2021 | 09:51 PM

mark a.

Lead Driver

Joined: Mar 2004

Posts: 8,924

Likes: 153

It's obvious it's a 1350 U joint. I would suspect a U joint failed at one time and wore the retainers the .070 difference. Get a new yoke, they aren't much money in todays dollars.