Ranger modified clutch bleed?
Melting Slicks
Joined: Apr 2012
Posts: 3,363
Likes: 100
From: IOWA!!!
Second the Amzoil
The M6 in a C5 is notoriously "notchy" to shift. Many owners complain about that trait. Many get some relief by changing the trans fluid to a full synthetic. Made a large improvement on mine but still has less than smooth shifting that one experiences in other manual trans cars. I used the Amsoil "Torque Drive Synthetic Automatic Transmission Fluid". Yes the M6 uses ATF for its lube...... 
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From: In a parallel universe. Currently own 2014 Stingray Coupe.
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Moved to C5 Tech.
Racer
Joined: Jul 2003
Posts: 333
Likes: 31
From: PA
THe original post was for an 02' but the subsequent post mentioned synthetic fluid in a 99'.
It got me thinking about the C5 sticky thread and I found this:
Manual transmissions -- Replacing the transmission fluid often helps shifting. Early transmissions have paper blocker ring that require Dexron III compatible (usually organic) fluid because some synthetics will destroy the paper blocker rings and subsequently the transmission. Later transmissions, and all rebuilt transmissions, have Kevlar/carbon fiber parts that allow the use of synthetic fluids. I believe the 98-00 transmissions have the paper blocker rings. The safe transmission fluids seem to be: GM Synchromesh PN #12345349, Honda ATF-Z1, Royal Purple Synchromax, Amsoil ATF, O’Reilly Dexron III ATF. The following transmission fluids may be unsafe for early transmissions: Redline D4 ATF, Mobil 1 ATF, Royal Purple Max ATF.
Related threads:
LS1.com - Ending the speculation: Blocker rings, who's had them fail?
LS1Tech.com - Ending the speculation: Blocker rings, who's had them fail?
Mobil 1 Synthetic ATF for a M6?
It got me thinking about the C5 sticky thread and I found this:
Manual transmissions -- Replacing the transmission fluid often helps shifting. Early transmissions have paper blocker ring that require Dexron III compatible (usually organic) fluid because some synthetics will destroy the paper blocker rings and subsequently the transmission. Later transmissions, and all rebuilt transmissions, have Kevlar/carbon fiber parts that allow the use of synthetic fluids. I believe the 98-00 transmissions have the paper blocker rings. The safe transmission fluids seem to be: GM Synchromesh PN #12345349, Honda ATF-Z1, Royal Purple Synchromax, Amsoil ATF, O’Reilly Dexron III ATF. The following transmission fluids may be unsafe for early transmissions: Redline D4 ATF, Mobil 1 ATF, Royal Purple Max ATF.
Related threads:
LS1.com - Ending the speculation: Blocker rings, who's had them fail?
LS1Tech.com - Ending the speculation: Blocker rings, who's had them fail?
Mobil 1 Synthetic ATF for a M6?
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
Just use the AMSOIL Torque Drive or its AMSOIL compatable fluid and the trans will be SAFE & HAPPY!!
BC
BC
Last edited by Bill Curlee; Jan 8, 2018 at 06:53 PM.
Instructor
Joined: Mar 2008
Posts: 112
Likes: 17
Rockland Standard (RS) SM150 vs. Amzoil Torque Drive
I saw your post about using Amzoil Torque Drive Synthetic ATF in the c5 manual transmission. Sounds like you and others have used it with good success. My car has 130000 miles on it.
The transmission was rebuilt by Bill Budreau who owns "The ZF Doctor" shop in Phoenix at about 100,000 miles. He used Kevlar clutches and higherformancemcomponents. He suggested Rockland Standard Gear's SM150 in the transmission and their 75w90 "Tranzilla" gear lube mixed with 4 ounces of the limited slip additive in the gear box.
Are you familiar with the RS lubes and if yes can you comment on how they compare to the Amzoil? Also how often do you recommend changing these fluids?
Thanks! Tom
