Sounds like gears chattering at takeoff....

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Posted by AustinTX (72.179.37.237) on 20:11:30 06/27/09

I'm back!

'96 Burb, K1500 - today it started making this terrible chattering noise in the drivetrain when taking off from a stop. Clears up with a "Klunk" around 40mph. If I start out in 4wd - it doesn't do it!

Only a couple of times has it just completely free-wheeled while making that noise, and that was while in reverse. Put it in park, then drive, and away we went.

I jacked up the rear end. Gave it the gas. No chatter. Put the parking break on to simulate a load. No chatter. Put the brake on with enough force the engine could barely turn the rear wheels - no chatter.

Lower it back down, take off from a stop - sounds like a bunch of marbles in a tin can and then "CLUNK" around 40mph. Again, if I hit the 4wd High switch, it stops.

I was thinking transfer case, but the fact that it didn't do it when jacked up with a load has me thinking limited slip rear-end.

Any ideas?

Follow Ups:

Re: Sounds like gears chattering at takeoff.... - Marty 22:26:57 06/28/09 (1)
- Re: Sounds like gears chattering at takeoff.... - AustinTX 06:11:58 06/29/09 (0)

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Comments:	: I'm back! : : '96 Burb, K1500 - today it started making this terrible chattering noise in the drivetrain when taking off from a stop. Clears up with a "Klunk" around 40mph. If I start out in 4wd - it doesn't do it! : : Only a couple of times has it just completely free-wheeled while making that noise, and that was while in reverse. Put it in park, then drive, and away we went. : : I jacked up the rear end. Gave it the gas. No chatter. Put the parking break on to simulate a load. No chatter. Put the brake on with enough force the engine could barely turn the rear wheels - no chatter. : : Lower it back down, take off from a stop - sounds like a bunch of marbles in a tin can and then "CLUNK" around 40mph. Again, if I hit the 4wd High switch, it stops. : : I was thinking transfer case, but the fact that it didn't do it when jacked up with a load has me thinking limited slip rear-end. : : Any ideas?
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