Slip Yoke my ass....................................

I have done a lot of research on the dreaded sileverado transmission clunk and have come to the conclusion that this is a internal transmission issue and not at all related to any slip yoke or spline greasing problem. Greasing of the spline may help dampen the "shock" to the drive train while shifting but is only a temporary fix. I often wondered how GM could blame this problem on the yoke when most of these transmissions only clunk in one shift sequence. Mine on the 2-3 upshift. If this were a yoke issue wouldn't this noise be there during all shifts? I did read one TSB from GM stating that this is a result of some solinoid issue that causes a momentary reversal of torque while shifting. This sounds more plausable.
Comments???????

If you are only feeling the clunk on a 2-3 shift, then you have some transmission problem....most likely it is the selnoid.......The yoke has nothing to do with it....

When I put 315's on mine the "clunk" went away. My best guess is the extra drag from the larger diameter tires, but it's gone.

mork, the clunk that i have heard about is from a dead stop.....
a 2-3 clunk, would be a transmission problem. reset your pcm, see if and for how long it goes away...

What is really interesting is that the 2-3 upshift clunk or clank doesn't exist on Tahoe or Avalance all with the same powertrain specs. Go figure!!

I have read thread on this problem on the tahoe and the avalanche, so yes they do have the same problem. So does the Cadillac Excalade.

Do the SUV's have a 2 piece driveshaft like our trucks?

My Silvey "clunks" and it is most definately the slip yoke. I took the driveshaft out and greased the yoke and no more clunk. Mine only clunked when taking off from a stop. Yes, greasing the yoke is somewhat temporary, about once a year, but I can live with that. The trick is not to use regular ol' grease. Get the stickiest, gooiest crap you can find. I use a wheel bearing grease actually.

I have read thread on this problem on the tahoe and the avalanche, so yes they do have the same problem. So does the Cadillac Excalade.

Yeah, one of the funniest things I ever saw. Was sitting next to a brand new shiney Escalade at a stoplight. Had my window down and when that Caddy took off..."SQWONK"! Made me feel a little bit better. :)

Down boy!!!!!!!! :D

Well, I dont know. I also got an 03 Tahoe and it dont clunk. My old 98 chevy also never clunked. My buddy's got an 04 Avalanche and it shifts smooth. How do you grease the slip yoke, mine's a one piece driveshaft and the slip yoke slides into the transfer case.

Shoot, mine clunks from a dead stop and the 1-2. I'm not totally sure ATM if it does it on the 2-3, but I wouldn't be suprised. I've had it documented at the dealership, because it was deemed as "normal". I've got about 17,500 on the clock now and I'd be worried more if it stopped doing it rather than continue.

There's obviously not a definite fix for this 2-3/3-2 clunk issue. I've heard so many temporary fixes it's not funny. But, I haven't greased the yoke yet. My first attempt in a few weeks to fix the problem will be a complete tranny flush, with a new filter, then put in Royal Purple Synthetic, and also replace the servo with Sonne(a)x 77767K & 77767SK super hold servo that states on their site guaranteed to fix this issue. If this doesn't work, I'm selling my truck. I will have owned it for a month. It sucks that I the consumer have to spend money to fix a manufacturing problem. There will never be a recall fellas, The big 3 are in the red. That's why they say it's normal, this problem is so widespread that they'd loose so much money. This is my first American vehicle, only because of the advice of my elders that we make crappy cars. This surely isn't helping, I love my country, BUT I might become a lifetime Nazi or Kamikaze driver for the rest of my life. I'll let you know if this works.

So, because of a clunk, you're gonna sell your truck? That's wise:loser:

So, because of a clunk, you're gonna sell your truck? That's wise:loser:

Yup, I guess you don't believe in quality craftsmanship. I've never owned a vehicle with this kind of problem, and if there was any problem it was fixed.
I wasn't asked if I like doggystyle. Normal sounds from any vehicle are interior squeaks that come from "age". Not a transmission clunk.

Had the clunk...used the new stuff the factory has for the transfer case and ...no more clunk!

My 2001 used to clunk so Chevrolet installed the undated nickle plated slip yoke under warrenty. That was 2 years ago and it hasn't clunked since. I've owned it since new and that's the only problem I've ever had.

y'know, the funny thing is.........so many people have this "problem", but no one I've heard of yet has had it do anything detrimental besides just be annoying. So if you wanna get rid of your truck for being annoying, so be it. I've yet to hear of a rear end, u-joints, transfer, yoke, splines, seals, bushings, or transmission to be adversley affected by the "clunk". Maybe the engineers did it for a reason.

Hey 99redsilverado,
Sweet truck! I've been contemplating black rims for my 05 Z71 ext cab, It's what they call "sport red". I call it burgundy. Anyway, I think yours looks BadAss! Later.

P.S. Go Dawgs!

I leased my 05. It can clunk all it wants and break all it wants because when it's off lease GM can have it back. Won't be my problem.

Had the clunk...used the new stuff the factory has for the transfer case and ...no more clunk!

What was that, a new type of fluid for it?

I've personally had it with the clunk but it's not going to make me sell my truck. This website has helped aleviate some of my pain by knowing I'm just one guy in a sea full of pissed off Silverado owners. I've replaced my u-joints, didn't help, I greased splines and it didn't fix the clunk but it temporarily fixed that awful squawk and slip heard when pulling out from a dead stop. My next move is to play with some more stuff, one day someone will figure it out, or GM will get flushed down the crapper.

Yeah, my 02' z71 has the same drivetrain issues.:banghead: I have had it into the dealer several times trying to find the culprit. they replaced the driveshaft yoke and that took care of the squeek/squak when accelerating, but I am still getting the 2-3/3-2 clunk. It sucks when people are riding in my truck I paid over 25000 dollars for and its making noises that my 45 year old chevy bel air doesn't even make. I agree that chevy knows that it is something more mechanical and that they just don't want to deal with due to costs. hey does anybody besides me think the brakes in these trucks are lame?

Here's the 2004 TSB about the 2-3 clunk. My 02 did it and my 05 does it. It is annoying, but I've haven't had trouble with either one.

A/T - 4L60-E/4L65-E, 2-3/3-2 Shift Clunk Explanation

Bulletin No.: 01-07-30-042B

Date: January 16, 2004

INFORMATION

Subject:
Information on 2-3 Upshift or 3-2 Downshift Clunk Noise

Models:
2004 and Prior Light Duty Trucks
2003-2004 HUMMER H2
with 4L60E or 4L65E Automatic Transmission (RPOs M30, M32)

Supercede:

This bulletin is being revised to add the 2004 model year. Please discard Corporate Bulletin Number 01-07-30-042A (Section 07 Transmission/Transaxle).

Some vehicles may exhibit a clunk noise that can be heard on a 2-3 upshift or a 3-2 downshift.

During a 2-3 upshift, the 2-4 band is released and the 3-4 clutch is applied. The timing of this shift can cause a momentary torque reversal of the output shaft that results in a clunk noise. This same torque reversal can also occur on a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied. This condition may be worse on a 4-wheel drive vehicle due to the additional tolerances in the transfer case.

This is a normal condition. No repairs should be attempted

the 'new' transfer case fluid (blue color) is called Auto-Trac 2...... changing to this fluid helped me a bit back in the day......but now I have a 'ping pong' ball in between my transfer case and differential.........no more sound......