HELPPPP!!!

[BHodge54]

First new to the forum and done some research already on this. But it's gone to a point where I'm not sure if "The infamous clunk" is the issue now?

I did or do have the clunk with my '03 Tahoe. But it has got to a point where I think there might be more wrong or worse with it.

I backed up and put it in drive, got on the gas a little hard and it clunked and continued to. No I didn't neutral drop it lol. Was at a full stop before hitting the gas. I was in my driveway and just took off out of it hard to get out in front of on coming traffic. Now I have a bad clunk that sounds like the driveshaft is coming apart when getting back onto the gas. Is the input spline shaft completely gone or can I still try the silicone grease trick?

I originally just thought the clunk was my my ujoints needing to be replaced. Until I started having this issue just now. It's so bad I don't even want to drive it..

Any insite or help would be gratefully appreciated...

 

[2011SSVHOE]

Crawl under it and check the U-Joints. If its clunking that bad you should be able to see something loose or not right

 

[BHodge54]

Crawl under it and check the U-Joints. If its clunking that bad you should be able to see something loose or not right

I did, it's not the ujoints. Jacked it up and had it in gear. Only happens at low speeds and jerks and clunks real bad.

 

[PG01]

Check flex plate to tq and motor to trans.

 

[PG01]

Is it only when u get on the gas? Or constantly as vehicle is moving or just motor running?

 

[BHodge54]

Only when I Accelerate from low speed or coming to a stop. As from what I could an the tell since I haven't taken it more then a block away from my house since it happen, it seems to be fine at speed..

 

[PG01]

So bssically when its downshifting

 

[BHodge54]

No.. its under acceleration when it happens more..

 

[PG01]

Well when you step on the gas it 'downshifts the transmission' into the next lower gear especially if you press the gas hard enough. And when you slow down the trans 'downshifts' into the next lower gear to slow the truck down. So are you pushing the gas hard enough to downshift it or is it basically at 'idle' so to speak and you are 'coasting' and it makes the clunk? 4wd or 2wd?

 

[BHodge54]

It's 4wd and I'm coasting and not on the gas hard.

 

[BHodge54]

Got under it this morning and pulled the driveshaft. It's not the ujoints. But I did narrow it down to the rear end. The Limited slip is kicking in and out real bad and Limited slip is kicking in and out real bad and jerking the truck.

 

[Kenny D]

Have you ever changed the oil? If I am not mistaken, there is an additive that needs to be added other than just 90w.

 

[rockola1971]

Congrats. Your rearend clutches are toast. You may have some busted springs in there too. Drain it, Pull the cover and after the grease is emptied you will see the clutch material laying in the bottom of the pumpkin. Ive never found an aftermarket supplier for the clutches. I had to get them from GM for my 99 OBS Sierra with a limited slip locking differential. If youve never done a rearend, your own is not one to "learn" on.

 

[BHodge54]

Dropping it off at the shop on Wednesday. Never done a rear end before and I'm not going to jump in on this one since it is my daily driver. Sucks but at least I know what the issue is..

 

[Maximus1]

You can buy a nice locker setup from Summit Racing. You won't be disappointed.

View attachment 79397

 

[Jackle1886]

Here's what I would install.

http://www.eaton.eu/Eaton/ProductsServices/Vehicle/Differentials/detroit-truetrac/index.htm

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