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Transmission, Rear End... Talk & Q&A! Tranny, rear end, drivetrain related stuff... shift it... grind it... pop da clutch!

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  #1  
Old 09-20-2022, 06:12 AM
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BillM BillM is offline
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Join Date: Nov 2009
Location: Southern Ontario
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Default U joint issues

This may be obvious to you guys, but it had me stumped for a bit. I've been chasing some U joint issues in the 51 Chev I'd built. I've put 3 rear U joints in it in 5000k. First time I thought it was likely I'd forgotten to lube, or faulty joint. Then it happened again. Checked angles, all good. Happened again. I'd saved the old joints (because that's what guys like I do). Now I started looking closer at them - all failed on the differential yoke only. The two driveshaft journals and cups were fine, as was the front joint. I found this video (below) online and I'm sure I've found the cause now - the pockets in the diff yoke are worn. New yoke is on the way.

https://4xshaft.com/blogs/faq/why-do...aking-u-joints
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Old 09-20-2022, 04:32 PM
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Good find Bill! Glad you got to the bottom of it
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Old 09-21-2022, 07:25 AM
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Old 09-21-2022, 04:15 PM
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forbigpicture forbigpicture is offline
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WAY TO GO BILL !!!!!!
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Learned a lot from my mistakes....think I'll make a few more....
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Old 09-21-2022, 09:42 PM
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Good detective work. I had that problem on my 74 Blazer long ago, the little tabs that keep it centered in the rear end yoke were worn down, constantly chewing up U-joints. I fixed it by selling it....
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