DriveLine Clunk

[seadoons]

OK so my slip yoke was replaced over a year ago with the nickel plated one and the problem went away. About 6 months after that it started kindof doing it again, all the dealer did was re-lube that spline. Fixed it, but now it is starting to do it again. I hate to keep taking it to the dealer, but it is annoying...

 

Question: How many of you have to keep having your driveline re-lubed?

Also, is it a DIY project?

[knipper_03]

from what I know it is a DIY project.

 

Remove 4 bolts from the u joint at the rear pull drive shaft out

and lube splines with grease and insert.

 

I haven't done it yet because I am worried that it may collect to much dirt

and also the grease may work its way into the transfer case.

[tom f]

mine is doing this bad,i may need to look at this do it yourself fix.

[Lou'sZ]

I have a bone stock 98 Z71 with the 350 and 4L60E tranny. When the tranny shifts from 2nd. to 3rd., I hear a definite "clink" or "tink" sound, can't really call it a clunk. I was talking to an independent GM mechanic whose opinion I would trust, about this. He said most driveline clunk can be eliminated by greasing the driveshaft splines where it slips into the rear of the transfer case and switching to the blue Autotrac fluid. Any ideas on my "tink" sound and has anybody done the gease and fluid switch yet? Doesn't the driveshaft just slip out of the rear of the transfer case? Is snthetic grease o.k. for the splines? This is what I have on hand. One more question-are the splines on the inside or outside of the driveshaft where it slips into the transfer case?

[jryerson]

I thought there was a zerk fitting for greasing the slip yoke. I moght be wrong though.

[89vette]

I had an 01 Silverado X-Cab that had this problem and the nickel plated yoke fixed it for me. Now I have an H2 Hummer and it does it the same way. It's usually 2 - 3 seconds after I start moving from a stop I hear and feel the thunk. Dealer says too bad it's normal. I'm going to try greasing it this weekend. Why can't GM get this right?

[motobrett]

My truck does this but I always suspected it was something related to the suspension or rear axle...something loose or out of spec...

 

Lubing it up is an easy job and don't be concerned about the grease getting into the tcase...

[RyanZ71]

I thought there was a zerk fitting for greasing the slip yoke. I moght be wrong though.

I believe that is only on the 2WD models and not the 4WD

[PunchT37]

GM has a special lube just for slip yokes. Get a can of this and add a little blue

autotrac oil to the grease and stir until it`s blended. This stuff works the best.

Any grease will stop the clunk,but it returns in 2 to 3 weeks usually. Remove

the shaft and clean all the old stuff out. Spray some brake cleaner in it to remove

old residue. Let dry and lube with new stuff. Only the rear shaft on 2wd needs

to be done. Big aluminum shaft on 4wd needs to be done. This will last the

longest. Mine has lasted for a year now, and i used to do it ALL the time with

moly lube and the like. Seems like GM should know about leaf spring

driveline angles after 100 yrs.

[pacodiablo]

Make sure all of the bolts for the driveshaft are tightened to the proper torque and check the u-joint bearings. Those may cause a clunk.

[tom f]

alright,can somebody give me some detailed instruciton on this?

[tom f]

btt