How to grease drivetrain slip yolk? - Page 4 - Chevy and GMC Duramax Diesel Forum
06-07 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #31 of 34 (permalink) Old 12-25-2019, 08:39 PM
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Guess I should have specified, but my truck is a 2WD with the 2 piece drive shaft. A slip joint is the joint between the 2 shafts and that is what I greased and what cured my clunk. I really know nothing about 4 WD setups.

I guess this could also cure a clunk if done at the yoke where the shaft connects to the transmission or transfer case if there is slop there? Not really sure about grease in the transmission or transfer case and whether it would harm anything but I kind of doubt it. Would think that as long as you don't go nuts with the grease, it would just stay on the splines.

2002 Chevy 2500HD Crew - Original owner - 410,000 miles so far. All stock with the exception of a lift pump.
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post #32 of 34 (permalink) Old 12-26-2019, 05:44 PM
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GM has a synthetic grease for the slip yoke specifically designed for it, I got it for my 2 wheel drive Tahoe, and wow it really stopped the clunk for several years. You can see on the instructions it's for the slip yoke and is designed to interact with transmission fluid.
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2019 GMC Sierra Denali 2500HD Duramax L5P
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post #33 of 34 (permalink) Old 02-05-2020, 10:01 AM
 
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I bought this 3 oz tube of Motorcraft spline lube on Amazon. A lot less $ than the quart of GM stuff.
It worked-no more bumps. I have a long bed Chevy with 2 piece driveshaft. Other greases I tried didn't last very long. Never tried Red & Tacky though.
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post #34 of 34 (permalink) Old 02-05-2020, 10:08 AM Thread Starter
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I haven't driven my truck a ton since I greased the slip yolk with "Red & Tacky"... but so far I have not felt the clunk again. With my wife being pregnant and on bed rest, I haven't been doing much fun stuff lol I will try and report back after I get some miles on it.

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Originally Posted by JohnRB View Post
I bought this 3 oz tube of Motorcraft spline lube on Amazon. A lot less $ than the quart of GM stuff.
It worked-no more bumps. I have a long bed Chevy with 2 piece driveshaft. Other greases I tried didn't last very long. Never tried Red & Tacky though.

Brand new to me, 2006 LBZ motor w/LLY tune (I think?). CCSB 4x4 LT model, white in color. 6 speed trans with tow button and +/- switch.

221,000 miles, all original, bone stock for now.
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