The Transmission / Differential FAQ

[Whizbang]

Limited Slip Information

Q. Where can i get rebuild parts for my OEM Limited Slip?
A. either the dealership or check Mazdatrix.com. The direct link is HERE

Q. What fluid should i use with my limited slip?
A. If it is a clutch type, then use a fluid that had additives for LSD or otherwise indicates it is safe for LSD use. Mostly higher quality fluids fall under this. Also, synthetic fluids is a good choice for any differential.

Mazda Limited Slip Units

Mazda Rx7 83 Clutch Type (GSL models)
Mazda Rx7 12A 84-85 Clutch Type (GSL models)
Mazda Rx7 13B 84-85 Clutch Type (GSL-SE) (Limited Slip is less aggressive than 12A model)

Mazda Rx7 13B 6PI 86-88 Clutch Type (GXL, GTU)
Mazda Rx7 13B Turbo 87-88 Clutch Type (Turbo II)
Mazda Rx7 13B 6PI 89-92 Viscous Type (GTUs)
Mazda Rx7 13B Turbo 89-92 Viscous Type (Turbo II)

Notes:

• 1983 and earlier models do not interchange with 84-85 models. Changes in axle design do not allow the interchange.
• Turbo LSD units do not interchange with Non-Turbo LSD units.

Aftermarket Torsen Limited Slips
see Mazdatrix.com for details

84-92 Non-turbo ------ MZTX-TORSEN1
93-95 Twin Turbo ----- 27-200E-P099

Torsen Limited Slips per Mazdatrix:

These very unique torque sensing differential limited slip units are now available for 84 and later RX-7's. They really are the absolute best design for rear traction under ALL different conditions. It is able to transmit far more torque to the wheel that still has traction than any other type of differential. It uses the friction of the worm gear teeth and the thrust washers for the differential limiting force. In comparison with viscous type, or friction type LSD, it has the following benefits:
1) Large bias ratio torque proportioning
2) Less change of bias ratio over time of car use
3) No special differential oil or LSD additives needed
4) Improved overall traction and improved controllability under acceleration.
5) Virtually no change of torque sensing or traction control through differential temperature range.

Aftermarket "Kaaz" Limited Slips

Cost for Kaaz clutch type limited slip range from about 950 to about 1100 dollars.

WPC coating reduces the "clicking" and "clunking" noises associated with a strong working limited slip.

1.5 Way (Suitable for Road Racing)

• 84-92 N/A -------------------- DBZ1810
• 84-92 N/A WPC COATED ------- DBZ1810-WPC
• 87-88 TURBO ----------------- SBZ1310
• 87-88 TURBO WPC COATED ---- SBZ1310-WPC
• 89-92 TURBO ----------------- SBZ1315
• 89-92 TURBO WPC COATED ---- SBZ1315-WPC

2 Way (Suitable for Drifting / Drag Racing)

• 84-92 N/A -------------------- DBZ1810-2
• 84-92 N/A WPC COATED ------- DBZ1810-WPC-2
• 87-88 TURBO ----------------- SBZ1310-2
• 87-88 TURBO WPC COATED ---- SBZ1310-WPC-2
• 89-92 TURBO ----------------- SBZ1315-2
• 89-92 TURBO WPC COATED ---- SBZ1315-WPC-2