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Old 03-24-2004, 08:18 AM   #1
1SC
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Question Funky noise in reverse, from rear-end??

I've noticed something weird with my old Chevelle since I've got it back on the road. I don't know if it's a problem or not.

if I'm trying to 'ease' back in reverse, sometimes I get a jerking type motion going on, and will get an ugly clanking/knocking noise coming from the rear end. If I give it more gas and back up faster, it stops. Doesn't happen all the time either, it seems to happen more when I'm turning while backing up. I have no such noises going forward at all.

I have an 8.5" 10-bolt with a new eaton posi and 3.42 gears. I also have a 2000 stall, a bit higher than the stock converter. Dunno if that could have anythin to do with it or not (like the converter kinda halfway 'locking' while backing up, just enough to 'jerk' the driveshaft instead of turn it smoothly?) My other thought is that the posi is acting up in reverse for some reason. I'd think it would do the same thing creeping forward though?

Any ideas? Is it something I should be concerned about?

Last edited by 1SC; 03-24-2004 at 08:21 AM..
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Old 03-24-2004, 09:29 AM   #2
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Did you put the limited slip additive in the oil or use an oil with the additive already in it? Even if you did it will probally make some noise, especialy when backing. All the posi's I've had experiance with do. How new is it?
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Old 03-24-2004, 10:12 AM   #3
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Yeah, I put a bottle of GM limited slip in it, and I'm using Mobil 1 Synthetic gear lube, 80w90 I think.

It's very new, I probably have less than 200 miles on it since I've had the car back on the road.
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Old 03-24-2004, 10:48 AM   #4
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I'd say its just the nature of a high performance posi. Shouldn't be as bad when you get some more miles on it. Personally, I wouldn't worry about it. As long as it working fine and not making much sound going forward. But it will always sound off some when turning much at slow speeds. Thats my experiance with them anyways.
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Old 03-24-2004, 05:51 PM   #5
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You really haven’t put enough tight turning miles on the eaton unit to get the limited slip lube worked into the clutches. Running straight, the clutches are just….there…and doing nothing. The more you drive it around doing tight turns such as pulling in drives, turning around in parking lots etc, the popping should eventually quit.
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Old 03-29-2004, 09:45 AM   #6
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B, Check with Wendy. I told her something about this.
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