Так этот узел сам смазывается, АТФкой из АКПП и Раздатки на 2вд и 4 вд.
Стукать там может если передние сайленблоки задних рессор в хлам, а вот нижняя шаровая убитая на передних рычагах, щёлкает по всему кузову.
Весь американский интернет и ыутуб полон инфы про стук/толчок как у меня, у кого при старте ,у кого при остовке,и как с етим воевать.
Есть минимум два бюлетня от ГМ'а- для полно привода и недопривода.Отличия описал выше- после промывки шлицов карб клинером
надо смазать или атф (4wd ) или конситентной(2wd ) и радоватся.
#09-04-17-002C: Bump Feel/Clunk Noise at Stop or from Launch (Clean/Lubricate Propeller Shaft 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