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Tool Talk Discussion Forum

95 GMC u-joints

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Dopp Creek

04-06-2021 20:43:59




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While I am waiting for my transmission parts I thought I would replace the u-
joints in the front and rear driveline. The front shaft from the transfer case to the front axle had the caps standing proud of the yoke about .030 and 90 degrees to that the caps fit snugly in the yoke as they should. When I pushed out the cross, I found snap ring grooves about half way in the yoke. I have not seen a u-joint that was not secured with clips. I had the auto parts guy pull up the specified joint and it was the same dimension as the one I removed. I also noted this strap affixed to the two caps that are secured in the yoke. Can someone tell me what I have and if they run u-joints without clips?
The light bands on the 12:00 & 6:00 caps are where the grooves are in the yoke.

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Hobo,NC

04-08-2021 04:59:37




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 Re: 95 GMC u-joints in reply to Dopp Creek, 04-06-2021 20:43:59  
Humm... Can you explain how to install'em with the caps on...
I always pull all the caps and make sure all the roller pins are intact. While there add a little grease to hold them well while installing the caps.
Personally I prefer sealed joints (no grease fitting). Injected plastic I use a torch to head them for take off while there cut the cross out : )



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T.R.K.

04-07-2021 18:29:26




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 Re: 95 GMC u-joints in reply to Dopp Creek, 04-06-2021 20:43:59  
I just want to add: Be sure to put the clips on ALL the caps in the rear 'cross'!

I bought a Tahoe about 6 years ago and last year about halfway to work my rear drive shaft started 'clunking'. I made it back home, but found that some yahoo had put the rear caps under the straps on the pinion yoke without the clips and one of the caps was missing. It had taken about 5 years to work its way out from under the strap.

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Stephen Newell

04-07-2021 18:22:49




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 Re: 95 GMC u-joints in reply to Dopp Creek, 04-06-2021 20:43:59  
The U-Joint itself doesn't have snap rings. You can easily pull the caps off. Just don't pull the caps off the new U-joint, there is nothing but grease holding the needle bearings in. The snap rings hold the U-joint in the yoke and the drive shaft.



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rustred

04-07-2021 09:33:14




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 Re: 95 GMC u-joints in reply to Dopp Creek, 04-06-2021 20:43:59  
that is the factory set up with plastic. that strap holds the 2 end caps on when u joint is removed from shaft. i have replaced lots of those in the garage years back . never used heat on one either. plastic is not that tough.



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miangus

04-07-2021 06:29:03




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 Re: 95 GMC u-joints in reply to Dopp Creek, 04-06-2021 20:43:59  
Will likely have inside snap rings on replacement. Use a flat file to clean inside flat for snap ring. I use a brake hone to polish the bores. A little prep makes for easy assembly. I am surprised you got it apart without melting the epoxy. Usually things get wrecked if the epoxy isnt melted.



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Dopp Creek

04-07-2021 14:36:27




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 Re: 95 GMC u-joints in reply to miangus, 04-07-2021 06:29:03  
I used a ball joint press and the end of the cap broke on both sides. After that I cut the cross out and then knocked the rest of cap to the inside with a punch. Amazing to me that these might be the original u-joints after 25 years



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4play

04-06-2021 22:22:55




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 Re: 95 GMC u-joints in reply to Dopp Creek, 04-06-2021 20:43:59  
I always torched them to melt the plastic. Find the little holes in the yoke where the plastic is injected, you want to point the holes away from you because sometimes the melted plastic will shoot out and can burn you.
You might have to use a pick or small flat head to clean the grooves so rings will fit.



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wore out

04-06-2021 21:03:57




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 Re: 95 GMC u-joints in reply to Dopp Creek, 04-06-2021 20:43:59  
[quote="CVPost-Dopp Creek"]/quote]

"I found snap ring grooves about half way in the yoke"

Those are NOT "snap ring grooves", when the driveline was made the cups were pressed into place in a jig that located them exactly, then some sort of plastic was injected into the grooves that locked the cups in place when it cooled/hardened.

You can see the remnants of that plastic in the grooves in the "cups" that you have removed.

The correct "cross kits" will have snap ring grooves in the cups and come with snap rings that get installed on the cups on the inner side of the yoke.

HOPEFULLY when you knocked out the cups and sheared the injected plastic you didn't deform the yokes. I predict you have a bit of a challenge ahead of you to get the cups installed and locked in place with the snap rings that come with the kit.

Post back if you need any more details.

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old

04-06-2021 21:20:44




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 Re: 95 GMC u-joints in reply to wore out, 04-06-2021 21:03:57  
I learned years ago to get them out you heat them up to melt the plastic or you ed up bending the yoke on the drive shaft



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504

04-06-2021 21:02:30




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 Re: 95 GMC u-joints in reply to Dopp Creek, 04-06-2021 20:43:59  
GM has not used clips from the factory for 30 years or longer. Polish the holes with emery cloth and the new ones will have clips,probably on the inside of the crosses. I usually put a little heat on them before I drive them out.



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