Switched rear-ends no movement???
Thread Starter
Cruising
Joined: Jun 2019
Posts: 11
Likes: 0
From: Milton, WI
Switched rear-ends no movement???
I've got a 2000 convertible, LS1 5.7 auto. I recently picked up a 3.42 Z06 rear-end. Installed it. put it in gear, no movement forward or reverse. When I putit back into park, I heard the park fork in the trans go click-click-click. Which tells me the trans is working fine. The rear-end is not putting the power to the wheels. Anyone have any ideas? Thanks
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
Did you remove the diff seal plate from your auto diff and put it on the 3.42 diff before you did the install?
A4 requires the diff plate. The MN6/M12 does not. So the Z06 doner diff needs your old plate on it before you install it.
If you did that already I'm out of ideas. My A4 knowledge is bubkis.
A4 requires the diff plate. The MN6/M12 does not. So the Z06 doner diff needs your old plate on it before you install it.
If you did that already I'm out of ideas. My A4 knowledge is bubkis.
Last edited by Johnny Hardcore; May 27, 2022 at 03:47 PM.
Thread Starter
Cruising
Joined: Jun 2019
Posts: 11
Likes: 0
From: Milton, WI
Did you remove the diff seal plate from your auto diff and put it on the 3.42 diff before you did the install?
A4 requires the diff plate. The MN6/M12 does not. So the Z06 doner diff needs your old plate on it before you install it.
If you did that already I'm out of ideas. My A4 knowledge is bubkis.
A4 requires the diff plate. The MN6/M12 does not. So the Z06 doner diff needs your old plate on it before you install it.
If you did that already I'm out of ideas. My A4 knowledge is bubkis.
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
Pro
Joined: Apr 2018
Posts: 563
Likes: 201
From: Montgomery City, MO
I've yet to tear into one of these, but knowing how diffs work, the most likely explanation is that the spider gears are sitting in pieces at the bottom of the case.
Thread Starter
Cruising
Joined: Jun 2019
Posts: 11
Likes: 0
From: Milton, WI
I ripped it apart
No offense, but if you have the mechanical ability to install it, you have the ability to check it out before going to all that trouble. If you took it somewhere to be installed, that person / shop would have also possessed said know-how. So no point trashing the salvage yard. The first word in their label is "salvage". This is why I just turn my head and walk away when someone suggests installing a used automatic transmission in a car they value.
I've yet to tear into one of these, but knowing how diffs work, the most likely explanation is that the spider gears are sitting in pieces at the bottom of the case.
I've yet to tear into one of these, but knowing how diffs work, the most likely explanation is that the spider gears are sitting in pieces at the bottom of the case.
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Thread Starter
Cruising
Joined: Jun 2019
Posts: 11
Likes: 0
From: Milton, WI
Thanks for the heads up, on the shops in the area!! I ended up pulling it apart. The clutch packs are shot, and the spring washers are broke. I have them ordered and on the way. It really wasn't much to it. Thanks again!!
Thread Starter
Cruising
Joined: Jun 2019
Posts: 11
Likes: 0
From: Milton, WI
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
I was going to check back in on this thread. Glad you got it sorted out and posted up progress.
You'll be back at it in no time!
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,668
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
If i missed that part of the thread u can yeah at me.
Drifting
Joined: Mar 2015
Posts: 1,421
Likes: 302
From: CSRA, SC
You didn't get sold a junk diff, you got sold a normal used C5 diff. There are more C5s running around on busted spring washers and roasted clutches than there are with good diffs. As mentioned the burned up LSD won't cause the car not to move. In fact there's nothing that wouldn't be OBVIOUS to any lay person at Wal-Mart that can go wrong with the diff to cause the car not to move. Sounds like a 4L60 problem to me. Lots of reasons why a 4L60 might not actually move the car.
Pro
Joined: Apr 2018
Posts: 563
Likes: 201
From: Montgomery City, MO
Very first post:
He says he tore it down, so I would think a broken output shaft or spider gear would be fairly obvious. However, it's entirely possible to assemble the carrier with one or no spider gears and have no movement. I figured it's possible if he doesn't have a FSM and know what parts should be in it...
Though the OP didn't specify that it moved prior to the diff swap, another possibility is the trans output shaft is broken or the rear planetary splines are completely wiped out.
Though the OP didn't specify that it moved prior to the diff swap, another possibility is the trans output shaft is broken or the rear planetary splines are completely wiped out.
Last edited by spfautsch; Jun 8, 2022 at 03:59 PM.