C6Z Diff Break Away Torque
Safety Car
Joined: May 2011
Posts: 3,807
Likes: 508
From: Oshawa, Ontario
Thread Starter
Instructor
Joined: Mar 2008
Posts: 110
Likes: 1
From: Topeka KS
It's 2007 ZO6 with 6300 miles on it and used primarily for autocross. Break away torque is normally around 110 ft. pounds, mine was around 55 ft. pounds. Has any of you racers checked your diff torque lately?
Race Director
Joined: Dec 2013
Posts: 12,505
Likes: 3,634
If I was a betting man, would dare to guess that someone changed out the OEM diff lube of Dextron LS Gear Oil 75W-90, part #88862624, and installed an another type lube with a higher content of either slip additive or the lube itself isntead.
Hence it not uncommon for this with the strip crowd to do this, to end up with peg leg burn out instead.
If the dif clutch packs burnt out with only 6K mile on it/ diff was filled with Dextron LS Gear Oil 75W-90, part #88862624, then you have other problems on hand, even with a lot of autocross driving.
On the other hand, if you are running something like A6 tires with huge grip and the mileage is 60K instead, then could see the diff packs wearing out in this amount of time with all the tight low speed cornering instead.
Thread Starter
Instructor
Joined: Mar 2008
Posts: 110
Likes: 1
From: Topeka KS
If I was a betting man, would dare to guess that someone changed out the OEM diff lube of Dextron LS Gear Oil 75W-90, part #88862624, and installed an another type lube with a higher content of either slip additive or the lube itself isntead.
Hence it not uncommon for this with the strip crowd to do this, to end up with peg leg burn out instead.
If the dif clutch packs burnt out with only 6K mile on it/ diff was filled with Dextron LS Gear Oil 75W-90, part #88862624, then you have other problems on hand, even with a lot of autocross driving.
On the other hand, if you are running something like A6 tires with huge grip and the mileage is 60K instead, then could see the diff packs wearing out in this amount of time with all the tight low speed cornering instead.
Hence it not uncommon for this with the strip crowd to do this, to end up with peg leg burn out instead.
If the dif clutch packs burnt out with only 6K mile on it/ diff was filled with Dextron LS Gear Oil 75W-90, part #88862624, then you have other problems on hand, even with a lot of autocross driving.
On the other hand, if you are running something like A6 tires with huge grip and the mileage is 60K instead, then could see the diff packs wearing out in this amount of time with all the tight low speed cornering instead.
Thread Starter
Instructor
Joined: Mar 2008
Posts: 110
Likes: 1
From: Topeka KS
