99 2wd Silverado Breaks

[drumset5994]

Every time i let off the brakes on my silvy from a dead stop, there's a thud...like the breaks are hanging up a bit in the back.

 

Anybody have this problem? Anyone have any ideas?

[asilverblazer]

My bet is your slip yoke needs lubed. Drop your drive shaft, after chocking the wheels, and lube the part that goes into the transmission. I was told any kind of heavy grease will work.

[drumset5994]

That extensive, eh? sucks

[asilverblazer]

It's really not that hard. Only 4 little bolts hold the rear of the drive shaft to the differential yoke. The reason for chocking the wheels is because the transmission won't be holding the truck stationary with the drive shaft disconnected. Lower the drive shaft down with out banging it up too much, stick your fingers in some grease and smear it all over the part that goes into the transmission, put it back together and have beer.

 

Should only take about 30min, getting all the stuff out and putting it back up.

[drumset5994]

Well, i dunno if this helps, but if i slowly pump the brakes to a stop, it doesnt happen. If it press them hard to stop, i let off, and about a second later you hear a "thud"

 

Ive never done this before, so my confidence is in the toilet. I'll give it a try though.

 

Am i reading that you pull the yoke right out of the tranny after you've disconnected the drive shaft?

[asilverblazer]

Yes, you are reading it right.

 

What I noticed is that it was making the noise as the rear would settle or squat back down. When you stop hard the front goes down and the rear goes up, which pulls the driveshaft ever so slightly out of the transmission. When you take back off the front goes up and the rear goes back down, which pushes the driveshaft back in ever so slightly, as it slides in, it makes a squak/ lurching / thud noise. If you ease or coast to a stop the the rear will never raise and lower, thus the driveshaft does not move in and out, wiith no resulting noise.

 

What you could try is loading 500lbs into the rear of the bed, squatting the truck, this will push the drive shaft in and keep it there, the noise should change in some fashion, become more common or go away. I had 2 trucks and both behaved differently, one made the noise unloaded but not loaded. The other was the opposite, it made the noise only when it was loaded but not empty.

 

If you are too nervous about pulling the shaft, you might be able to get a couple of buddies to bounce the rear up and down (jumping on the bumper is always fun) while you lay under there soaking the yoke with WD-40 as it slides in and out, it probably won't last as long but it *might* be just enough to shut it up.

[mcreyaufmiller]

DO NOT USE REGULAR GREESE!!!!!!!

 

You need to use a transmission assembly lube to greese the shaft. The shaft is inserted into the tranny and the fluid circulates past the shaft washing anything that is on the shaft into the fluid. Regular Greese is not a good thing to have in the fluid. Just mt opnion.

[ken1mod]

This sounds like rear leaf spring wrap-up. Greasing the yoke is easy but probably is not the problem. there are many posts here about the spring cushions between leaves that fall off and need to be repalced.

 

I have chased this problem many times and it is always the rear leaf springs.

 

Ken

[asilverblazer]

DO NOT USE REGULAR GREESE!!!!!!!

 

You need to use a transmission assembly lube to greese the shaft.  The shaft is inserted into the tranny and the fluid circulates past the shaft washing anything that is on the shaft into the fluid.  Regular Greese is not a good thing to have in the fluid.  Just mt opnion.

 

<{POST_SNAPBACK}>

 

 

 

That's what I figured but the tech I asked at the dealership about this suggested using regular grease due to the price of GM's special lube... He may have been a retard, what ended up fixing mine was new t-case fluid.