Testing Diff Clutches
Thread Starter
Melting Slicks
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
Testing Diff Clutches
Is there anyway to test rear differential clutch packs without disassembling the diff for inspection?
I'm going over my Z06 before I start driving it this season. When I pulled the rear wheels off I noticed my left rear tire was worn much more than my right rear. Then I remembered one burn out I did where I had rubber on the left rear quarter panel but not so much on the right rear. I'm wondering if my diff is not locking properly. No diff noise, 60k miles, fluid looked clean when I drained it.
Anyway to test it?
I'm going over my Z06 before I start driving it this season. When I pulled the rear wheels off I noticed my left rear tire was worn much more than my right rear. Then I remembered one burn out I did where I had rubber on the left rear quarter panel but not so much on the right rear. I'm wondering if my diff is not locking properly. No diff noise, 60k miles, fluid looked clean when I drained it.
Anyway to test it?
Melting Slicks
Joined: Oct 2007
Posts: 2,464
Likes: 2
From: Cedarburg, WI
Well I don't know an official procedure but if I were you I would at least put down a water patch and do a burnout. Verify that both tires are spinning. Short of that I would call RPM Transmissions and get there advice!
Racer
Joined: May 2001
Posts: 253
Likes: 3
From: The Woodlands Texas
Jack up only one rear wheel, car in neutral, all brakes off. Put a torque wrench on the axle nut and measure the force needed to turn the wheel. If the wheel turns easily the limited slip is not working.
I have not seen a spec for the proper torque needed to turn the Getrag diff but I believe it was around 70 ft lb for the old posi's. (If memory serves, it has been a long time since I worked on a 12 bolt posi.)
I have not seen a spec for the proper torque needed to turn the Getrag diff but I believe it was around 70 ft lb for the old posi's. (If memory serves, it has been a long time since I worked on a 12 bolt posi.)
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Jack up only one rear wheel, car in neutral, all brakes off. Put a torque wrench on the axle nut and measure the force needed to turn the wheel. If the wheel turns easily the limited slip is not working.
I have not seen a spec for the proper torque needed to turn the Getrag diff but I believe it was around 70 ft lb for the old posi's. (If memory serves, it has been a long time since I worked on a 12 bolt posi.)
I have not seen a spec for the proper torque needed to turn the Getrag diff but I believe it was around 70 ft lb for the old posi's. (If memory serves, it has been a long time since I worked on a 12 bolt posi.)
Thats the procedure that I was told alsoBC
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
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Thread Starter
Melting Slicks
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
When jacked up, in neutral, and I turn one wheel it turns fairly stiffly but nowhere near 70 ft.lbs. The opposite wheel turns in the same direction which I know is correct for a limited slip diff. Both wheels have the same tension. It would be nice to know what torque is "correct" for the Getrag.