does zexel torsen diff need posi additive
07-09-2001, 06:51 PM
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does zexel torsen diff need posi additive
i just ordered the posi unit and it is going into the 95 diff that i am putting in my 82z. So i need to know if i need additive because i know it is a gear type and not clutch or cone posi. Those guys that have them please tell me
07-09-2001, 08:37 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I don't have a Zexel, but you answered your own question. The posi additive is a friction modifier to help the friction discs slip smoothly against each other in turns. Since the Zexel doesn't have friction discs, it doesn't need the additive.
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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
07-09-2001, 09:21 PM
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Car: '85 IROC
Engine: 305
Transmission: T-5
It doesn't need it, but probaby doesn't hurt. I saw something on Red Line oil site http://www.redlineoil.com/products.htm about their limited slip additive reducing friction and gear temperature, so that one might actually help. I've also found this on the Torsen site http://www.torsen.com/general/general_faq.htm
"Is it true that the Torsen unit in the production Camaro needs the GM modifier added?
GM issued a technical bulletin per our request to add the modifier to the rear axle oil. This was done to quiet what we call
a "Rusty Screw" noise that we heard in a very small percentage of vehicles. This does not happen in all cases, however to
address owner's concerns we asked that the modifier be used in all instances to insure that the driver would not get this
noise. When replacing the fluid it is at the owner's discretion whether or not to add the modifier. "
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1985 Yellow IROC-Z 5.0 HO, T-5 3.73 Torsen, 4 wheel disks
PFCM pads, GTA wheels, Koni yellows, B&M Ripper, Dynomax
"Is it true that the Torsen unit in the production Camaro needs the GM modifier added?
GM issued a technical bulletin per our request to add the modifier to the rear axle oil. This was done to quiet what we call
a "Rusty Screw" noise that we heard in a very small percentage of vehicles. This does not happen in all cases, however to
address owner's concerns we asked that the modifier be used in all instances to insure that the driver would not get this
noise. When replacing the fluid it is at the owner's discretion whether or not to add the modifier. "
------------------
1985 Yellow IROC-Z 5.0 HO, T-5 3.73 Torsen, 4 wheel disks
PFCM pads, GTA wheels, Koni yellows, B&M Ripper, Dynomax
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