Spec 87-92 Supra Turbo Mk3 Stage 3+ Clutch Kit (Different Discount Structure -10%)
A Mk3 Supra Turbo that has had its boost turned up, a bigger turbo bolted on, or a 1JZ-GTE swapped in will eventually slip a factory or mild street clutch in third and fourth gear. SPEC ST633F is SPEC's Stage 3+ kit for the 7M-GTE and 1JZ-GTE Supra with the R154 five-speed, and SPEC rates it at 620 ft-lb of torque. It is built for owners who want serious holding power without moving to a puck disc or a twin-disc setup.
The clutch is the link between the engine and the R154 gearbox. The pressure plate clamps the disc against the flywheel, and the friction lining has to hold every bit of torque the turbo engine makes, including the spike when boost comes on in a higher gear. SPEC's Stage 3+ uses a carbon semi-metallic friction material on a full-face disc rather than separate pucks. SPEC describes it as offering long life, a high friction coefficient and good drivability. The full face spreads heat and wear over more area than a 6-puck disc, so engagement is smoother than the puck-style Stage 3 kit while the clamp load and friction carry more torque.
SPEC lists the ST633F at about 24 lb shipping weight. Three SPEC kits share this application at different levels: the Stage 2+ ST633H, the 6-puck Stage 3 ST633, and this Stage 3+.
A slip test in fourth gear at low rpm with a smooth roll into full throttle is the simplest check: if the tach jumps and the car does not pull with it, the clutch is not holding. Before you condemn the disc, rule out the cheap causes. Bleed the clutch hydraulics, check that the pedal returns fully and the slave is not holding the fork partly applied, and look for oil on the bellhousing from the rear main or input shaft seal. Our slipping diagnosis guide walks through the checks, and flare vs slip helps you tell a true slip from other driveline feelings.
Our listing covers the 1987-1992 Toyota Supra Turbo (Mk3). SPEC's own application list for ST633F is a little wider: Supra Turbo Mk3 with the 7M-GTE or a 1JZ-GTE and R154, 1986-1993, plus the JDM Chaser and Soarer with the same engines. SPEC lists the turbo cars only, so do not assume it fits a non-turbo Mk3 with a different transmission. Swapped cars vary in flywheel and bellhousing combinations, so match the flywheel you are running and the transmission you have before ordering, or send us your year, VIN and swap details and we will check it.
If your car makes less power or sees mostly street use, the Stage 2+ ST633H will feel lighter and more forgiving. If you are pricing a full drivetrain refresh, our manual vs automatic repair cost guide lays out what a manual clutch job usually involves.
| Brand | SPEC |
| Part number | ST633F |
| Fits | Spec 87-92 Supra Turbo Mk3 Stage 3+ Clutch Kit (Different Discount Structure -10%) |
| Vehicle fitment | Toyota Supra (1987-1992) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
SPEC lists the Supra Turbo Mk3 with the 1JZ-GTE and R154 as an application. Swaps vary in flywheel and bellhousing parts, so send us your swap details and we will confirm before you order.
SPEC rates ST633F at 620 ft-lb.
SPEC sells three kits for this car: ST633H is Stage 2+, ST633 is Stage 3 with a carbon semi-metallic 6-puck disc, and ST633F is Stage 3+ with a carbon semi-metallic full-face disc.
SPEC lists only the Supra Turbo 7M-GTE and 1JZ-GTE applications for this kit. Do not assume it fits a non-turbo car.
Resurface or replace the flywheel, and fit a new release bearing and pilot bearing. Check the slave cylinder and fork pivot while the transmission is out.
