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Old 05-08-2011, 05:09 PM   eBay Motors  #1 (permalink)
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Slip Yoke

i have an 01 2500HD and below is what ive found(with forum help) that seems to be going on with my truck. question is i would like to try and do this myself cause im short on money. any walk thru or pics that might help or advice.? not sure where to start. any idea what kind of money to have dealer or garage do?

This condition may be caused by a slip/stick condition in the interface between the rear propshaft slip yoke and the transmission output shaft splines.thanks
Richard
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Old 05-08-2011, 05:33 PM   eBay Motors  #2 (permalink)
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I thought most people fixed this by pulling the rear driveshaft, cleaning/regreasing the slip yolk and reinstalling???
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Old 05-08-2011, 05:50 PM   eBay Motors  #3 (permalink)
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What condition? Is it a knock noise? There is a special grease you get from the dealership, unbolt the driveshaft and pull the slip yoke out. put a lot of the special grease in the yoke and put it back on. mark the shaft to re align it when you reinstall, Most slip yokes have a larger tooth or some way that they will only slide on one way, but its easier to make a line so you can see it while under your truck putting it back in. Sounds odd about a special grease but there really is one, and oddly enough regular grease doesnt work as well as this stuff
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Old 05-08-2011, 05:56 PM   eBay Motors  #4 (permalink)
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Is this what you are asking about-??

#09-04-17-002C: Bump Feel/Clunk Noise at Stop or from Launch (Clean/Lubricate Propeller Shaft Slip Yoke Splines) - (Jun 15, 2010)

. Part # is 19257121. Attached here is a TSB I pulled from another site.

Subject: Bump Feel/Clunk Noise at Stop or from Launch (Clean/Lubricate Propeller Shaft Slip Yoke Splines)


Models: 2007-2008 Chevrolet Avalanche, Suburban

2007-2009 Chevrolet Tahoe

2007-2010 Chevrolet Silverado (New Body Style) with Single-Piece Propshafts

2007-2008 GMC Yukon XL

2007-2009 GMC Yukon

2007-2010 GMC Sierra (New Body Style) with Single-Piece Propshafts

All Equipped with 4L60 Automatic Transmission (RPO M30) and 2WD



Attention: This bulletin contains a procedure to clean/lubricate the slip yoke splines and replace the slip yoke, if necessary. Check the history on this vehicle. If the lubrication procedure has been performed previously, then continue on and replace the slip yoke.

Condition:
Some customers may comment that the vehicle has a bump feel or a clunk noise at a stop or on launch. Customers may also comment that the bump feel or clunk is noticed after the vehicle has come to a complete stop and that it feels as if the vehicle was bumped from behind.

Cause:
This condition may be caused by a slip/stick condition in the interface between the rear propshaft slip yoke and the transmission output shaft splines. Braking to a complete stop can force the propshaft slip yoke forward into the transmission while the vehicle rebounds slightly backward after stopping its momentum and create this condition.

Correction:
Note: A bump feel or noise may also be due to fuel movement in the fuel tank when not completely full. If the condition is eliminated after filling the fuel tank, the noise is isolated to the fuel movement in the tank. Please make no repair attempts, as this noise is considered an operating characteristic.

Verify the customer's concern.

Clean/Lubricate Slip Yoke Splines:

Remove the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
Inspect the rear slip yoke splines on the drive shaft.
Clean the slip yoke splines with brake cleaner or equivalent and a shop towel.
Assure the yoke is free of rust or other foreign material.
Lubricate the slip yoke spline with grease, P/N 19257121 (in Canada, 19257122), using a brush or swab to completely cover the entire spline with a light coating of grease.
Reinstall the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
Road test the vehicle and verify that the noise is gone.
Note: Do Not replace the slip yoke unless the cleaning and lubrication procedure is ineffective.

If the vehicle has a repeat concern after lubricating the slip yoke splines, it may be necessary to replace the propeller shaft slip yoke with a new nickel-plated slip yoke.
Replace the Propeller Shaft Slip Yoke


Remove the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
Important: Some U-joints are fastened with nylon injection clips. If so, Do Not reuse the U-joint. Replace with GM P/N 12479126 U-Joint kit.

Replace the propeller shaft slip yoke with a new nickel-plated slip yoke. Refer to Propeller Shaft Slip Yoke Replacement in SI.
Install the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.

Parts Information:

LUBRICANT - Part#19257121 (in Canada, use 19257122)

SLIP YOKE - Part#19121437 - 2007 & 2008 - Utilities / Tahoe / Yukon and Avalanche

SLIP YOKE - Part#20877209 - 2009 - Tahoe / Yukon & 2007-2010 Pickups

JOINT KIT,PROP SHF UNIVERSAL - Part#12479126 (in Canada, use 10952423) Replace only if fastened w/nylon injection
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Old 05-08-2011, 08:07 PM   eBay Motors  #5 (permalink)
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Yes this it
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Old 05-09-2011, 06:21 AM   eBay Motors  #6 (permalink)
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well that is what im asking? do you pull just the rear half?
so i assume you take the rear part loose from the rear end?
clean the splines in the yoke, grease with special grease and reinstall?
assuming a lot i guess but havent done this before and cant find step by step!
Thanks
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Old 05-09-2011, 06:31 AM   eBay Motors  #7 (permalink)
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drain the t case oil, remove the bolts and retainers holding the D shaft to rear end yoke. May have to pry the u joint out of its home or give a few whacks. slide your driveshaft out. If its wet on the driveshaft I would change the output shaft seal at this time.

Clean up the internal splines real good. with the seal out its easier to clean the splines on the output shaft.

Grease the snot out of it with the GM lube and reassemble. Nothin much to it really.

Good luck
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Old 05-09-2011, 06:34 AM   eBay Motors  #8 (permalink)
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After a while if you notice the same feeling you need to go and get a new yoke. Merchant Automotive has em for a good price.

Depending on mileage I would also do the u joints since its all apart but thats just me.
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Old 05-09-2011, 06:45 AM   eBay Motors  #9 (permalink)
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is it a reg cab, exh cab or cc? yes unbolt the two u-joint straps on the rear diff, if you have a carrier bearing un bolt. and MARK THE POSITION OF THE SHAFT TO THE TRANS OR T-CASE also (I personally always mark the U-joint also just to be safe for vibrations and all) it will make it easier to reinstall, it has a larger tooth on the splines but it will be easier to just line the marks up when your under the truck to slip it back in. When you pull the shaft look at the splines and if they need cleaned do so, ive used brake cleaner before but usually they are fine. as stated above get the can of the GM special lube from the stealership and load the slip yoke up with it. It is a odd lite buleish green color... or it was few years back at least. anyway load the yoke up with it and reinstall. I agree if you have high mileage check your u-joints and replace now if needed. But its a real simple fix. I dont drain anything when I do it, jack the rear end up and its very minimal fluid loss if any. but not a bad idea to do if you want or if your driveline is down a lot. Easy fix and R and R...
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