Jocksagent

When did your truck start clunking? How many miles when it began?

bcb97

Most of the time the "clunk" is the slip yoke. All they do is drop the drive shaft off the rear axle, pull the driveshaft back pulling the slip yoke out from the transmission. Then they grease the hell out of the slip yoke assembly and reinstall. Probably squirt some grease other places as well. I have had the clunk noise in alot of my trucks and never had an issue with it. Once the grease on the slip yoke wears down again, it'll start making the noise again. It is actually a rather simple task to do in your garage.

Karl David Werner

Just bought a 2010 screw 4x4. 39k miles. Had the clunk when beginning to roll after stop. I pulled the drive shaft, cleaned and re-lubed the splines. Problem fixed!

72_Skunk

Just a thought; I would think using a small amount of anti-seize compound applied towards the interior end of the yoke might last longer than using grease. I would not use it along the full length of the yoke as it could contaminate the transmission fluid.
Also using too much grease and/or the wrong kind of grease could contaminate the transmission fluid also.

RES4CUE

Pretty sure the slip yoke is separate from the transmission fluid.

The slip yoke is on the driveshaft.

Karl David Werner

Since my truck is a 4x4, my slip yoke inserts into the transfer case, and it was separate from the transfer case fluid. No risk of contamination.

There was already some grease there, but it was pretty dry.

Not sure about using anti-seize. While it prevents seizure, I'm not sure what its lubricating properties are. It, in fact, seems rather gritty to me and I'd be concerned about actually causing wear. I'd probably only use it on non-moving surfaces (lug nuts, spark plugs for example).

I'd rather just pull it and re-grease it when needed. It's not a big procedure.