Anonymous007
Senior Member
Mine also does it after I get off a long drive on the interstate or when it’s cold in the morning before it warms up.
Then it stops. Is yours the same?
Mine does it after is warm
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Mine also does it after I get off a long drive on the interstate or when it’s cold in the morning before it warms up.
Then it stops. Is yours the same?
If your truck has a 2 piece driveshaft, the slip yoke is binding up and making that noise. The fix is a simple matter of lubricating the slip yoke. GM fought this for years. We'd use PTFE based grease and fix the problem.
Have them check the drive shaft. I had this same issue with a Nissan Titan. After two rear end swaps, and a driveshaft replacement, it turned out to be the splines on the two piece shaft binding. Final fix was cleaning and polishing the splines and a “special” grease (whatever that means). Seems to be a common problem on all makes with multi-section driveshafts.
Felt like a bowling ball rolling back and forth under the seat when taking off from a stop.
This just started happened with my brother-in-law 2019 classic about a month ago and was told it was the his transfer case. He also told them he feels a vibration along with the thud. He just dropped off his truck this morning for the repair. Hope this helps
I am also curious about this 2-pc driveshaft. When did this start and why. I could maybe see it on a mega-cab with an 8 foot bed. How common is this and again "WHY"?
If your truck has a 2 piece driveshaft, the slip yoke is binding up and making that noise. The fix is a simple matter of lubricating the slip yoke. GM fought this for years. We'd use PTFE based grease and fix the problem.
Try also going into vehicle settings and disabling hill start assist.
I had the thud when coming to a stop but thats usually due to the way the transmission skips gears or something during the downshift, but starting off with a thud is probably driveshaft/yoke related
Think about a bow and arrow. When you stop the truck, the combined braking and the lifting up on the rear body as the nose goes down causes the leaf springs to bow as if yo pull back on an arrow to load the bow. While stopped and the spring in bowed tension and the driveshaft in the extended position, all is good.... when the brakes are released and the gas pedal is hit, the bow in the rear springs relaxes and the rear of the body returns to nromal height.... and as the driveshaft yoke tries to return to it's previous compressed position, if it is dry, it will suddenly release and the result is the "thud/boom" from the driveshaft, differential, springs returning to normal positions.
Back from dealership, they said it was normal. Took the mechanic on a ride and he was a ********* basically. Kept calling it a 9 speed
Dont know what steps to take next. Do i take this to my mechanic and have him grease the splines and whatever needs to be greased?
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It depends upon whether or not you want to solve the problem.
Think about a bow and arrow. When you stop the truck, the combined braking and the lifting up on the rear body as the nose goes down causes the leaf springs to bow as if yo pull back on an arrow to load the bow. While stopped and the spring in bowed tension and the driveshaft in the extended position, all is good.... when the brakes are released and the gas pedal is hit, the bow in the rear springs relaxes and the rear of the body returns to nromal height.... and as the driveshaft yoke tries to return to it's previous compressed position, if it is dry, it will suddenly release and the result is the "thud/boom" from the driveshaft, differential, springs returning to normal positions.