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
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
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.