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Old 06-20-2004, 09:46 PM
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Bad Yoke?

It's done it again. My truck destroyed another rear U-joint. Is it possible that the rear yoke is vibrating the joints apart? The truck is a '93 1500 141 inch wheelbase extended cab short box 2 wd Chevy. This will be the third u-joint since mid March. The one that just broke was a Precision 355 heavy duty unit that was pressed in at a local shop. The one prior I put in almost a year ago. I make it a point to grease all three u-joints and the carrier bearing once a month. If anyone's got a guess as to what's happening, please type back.

Confused in WI

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Old 06-20-2004, 10:18 PM
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Ok, just an idea as to what could have happened. My neighbor had the same problem with his truck but his was a Ford. His axle was held in place by the pressure of the bottom bracket and the leafe springs on the top held together with the U-bolts. It wasn't welded directly to the purch mountso over time it rotated, then he started going through U-joints like crazy also. Then he rotated his axle back to the right angle and welded it to the perch mounts and now it doesn't happen. I don't know if your truck already has the perch mounts welded in place or not but if not that could be a problem.
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Old 06-21-2004, 07:24 AM
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Arrow

A stab in the dark, how about pinion angle? You can also try the knowledge base for more info. Let us know what you find.
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Old 06-21-2004, 03:03 PM
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Thanks for the tips. Kinda sounds like the pinion angle is to blame.
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Old 06-22-2004, 05:07 PM
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Maybe the pinion isn't totally to blame. The inside edges of the yoke are starting to wear on the top left and bottom right edges as you look at it from the front. The two caps on the driveshaft were fine, but the other two were totally dry, no grease, no pieces of needles, nothing but dust.

I ordered a new yoke and seal kit so I'll just have to see how it lasts.

Thanks,

Chet
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Old 06-23-2004, 05:34 AM
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I was going through about 2 u-joints a year in the 36 and just about everyone I talked to said it was a bad pinion angle. I measured it several times and it was exactly on the money. Then I talked to a drive line shop out of Springfield Mo and they are the one's that finally said the rear yoke was wore out, I put a good one on and Have not lost a rear u-joint in over two years.
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