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Username Post: k1500 Suburban rear end noises        (Topic#373164)
Posts: 15

Reg: 03-02-23
05-25-23 04:31 PM - Post#2858335    

I've had my 88 k1500/v10 with a 350tbi for some time now. I went ahead and posted this in the 73-87 thread as I thought it might pertain better to these vehicles (move/delete if I'm wrong)

The rear end has always made a clunk noise when shifting gears from park/neutral/drive.
I've ignored it since it's an old beat up truck that I'm not familiar with and runs and drives fine.

It doesn't always do it, sometimes its a hard clunk other times a softer tink but it makes noises and it's progressively getting a little more noticeable.

Sometimes when I'm reversing I can hear some noises from the rear when I start to accelerate, likewise in drive when I'm turning sometimes, its kind of random.

A few weeks ago I played with my U joints, which don't seem to have any play. And I flushed and changed my diff fluid with some 80w-90 conventional and have no difference.

While the diff cover was off, my buddy took a video of what was going on inside the rear while I switched gears. He also took a video of me switching from park to reverse and what the driveshaft looks like when it does it.

I plan to keep running it, never any real issues apart from what I've mentioned. But It's not a good thing and wanted to know what you guys have to say or think is happening exactly.

Below is two links to the videos previously mentioned, thanks.

Inside diff (57 seconds): U4tM...

Driveshaft doing a flip: JLOS...

(Video quality will increase later)

Edited by Karnawgie on 05-25-23 04:33 PM. Reason for edit: No reason given.

Valued Contributor
Posts: 2949

Loc: Lake George, NY
Reg: 11-11-15
05-25-23 04:49 PM - Post#2858336    
    In response to Karnawgie

Typical G80 locking differential noise when they are going bad. Adding limited slip additive, then driving slowly in figure eights may help.

Member #271 Senior Chevytalk Moderator
Posts: 25881
Loc: Austin, TX 78748
Reg: 05-09-00
05-25-23 06:20 PM - Post#2858341    
    In response to Shepherd

I’m not familiar with G80. Plenty of them don’t last.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE

Valued Contributor
Posts: 2949

Loc: Lake George, NY
Reg: 11-11-15
05-25-23 06:29 PM - Post#2858344    
    In response to gchemist

Common Eaton based diff in GM trucks, had one in my 2003 TB, same basic symptoms. Don't think this one is repairable.

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