2008 Rear Diff and Manual Trans Fluid Change
Thread Starter
Racer
Joined: Feb 2001
Posts: 451
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From: Chesapeake VA
2008 Rear Diff and Manual Trans Fluid Change
My '08 has 8k miles on it and I'm going to change the rear end and MZ6 trans fluids. I currently do not hear any rear end chatter. Recently, I searched the Tech/Perf section of my favorite forum and "Vet" has a great post from 2006 and I have read the 1/09 TSB. In my '05, I used Red Line D4 ATF for the trans and Red Line 75w90 gear oil w/4oz of friction modifier. I have a gallon of D4 ATF left so I would like to stick with that, but what about the rear? I would like to use Red Line again but it seems the new GM 88862624 (which has the friction modifier already in it) is working pretty well. Has the rear end changed since '05 or just the recommended maintenence? Anyone with an '08 use the Red Line.
Team Owner
Joined: Dec 2002
Posts: 32,074
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From: San Francisco CA
My '08 has 8k miles on it and I'm going to change the rear end and MZ6 trans fluids. I currently do not hear any rear end chatter. Recently, I searched the Tech/Perf section of my favorite forum and "Vet" has a great post from 2006 and I have read the 1/09 TSB. In my '05, I used Red Line D4 ATF for the trans and Red Line 75w90 gear oil w/4oz of friction modifier. I have a gallon of D4 ATF left so I would like to stick with that, but what about the rear? I would like to use Red Line again but it seems the new GM 88862624 (which has the friction modifier already in it) is working pretty well. Has the rear end changed since '05 or just the recommended maintenence? Anyone with an '08 use the Red Line.
On the rear end I can't tell.
Can anyone tell the difference in how the auto trans shift once you switch to Redline or Amsoil from factory? Or is it the same as the rear end diff where you can't tell.
Burning Brakes
Joined: Feb 2002
Posts: 1,232
Likes: 10
From: Montrose Colorado
Did you feel any difference from switching from the factory fill trans fluid to the Redline? Was it alot smoother and easier to shift? It was for me when I did that change.
On the rear end I can't tell.
Can anyone tell the difference in how the auto trans shift once you switch to Redline or Amsoil from factory? Or is it the same as the rear end diff where you can't tell.
On the rear end I can't tell.
Can anyone tell the difference in how the auto trans shift once you switch to Redline or Amsoil from factory? Or is it the same as the rear end diff where you can't tell.
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From: King George VA
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Le Mans Master
Joined: Jan 2001
Posts: 6,451
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From: Maryville TN
St. Jude Donor '06-13,'16-'17, '19
Most C6 users seem to have had very good luck with the AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 and one bottle of AMSOIL Slip-Lock Differential Additive.
Tom
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Team Owner
Joined: Dec 2002
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From: San Francisco CA
Based on what I've read, I feel the majority of GMs change has been to increase the amount of friction modifier in their fluids. Most C6 users seem to have had very good luck with the AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 and one bottle of AMSOIL Slip-Lock Differential Additive. Not sure about Red Line and a bottle of additive. Haven't read too many posts about those using that with opinions one way or the other. I suspect that you'll be fine with the Red Line and one bottle of additive.
Team Owner
Joined: Dec 2002
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From: San Francisco CA
Thread Starter
Racer
Joined: Feb 2001
Posts: 451
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From: Chesapeake VA
Drifting
Joined: Oct 2004
Posts: 1,790
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From: STL MO
St. Jude Donor '09-'10
Good to know, I wouldn't mind changing out my M6 fluid with the Redline.
I have switched both the vette and the TrailBlazer SS rear-ends with the new GM LS diff fluid and both are now quiet.
Thanks for sharring.
I have switched both the vette and the TrailBlazer SS rear-ends with the new GM LS diff fluid and both are now quiet.
Thanks for sharring.
