Spec Porsche 944 N/A Stage 3+ Clutch Kit
SPEC SP313F is the Stage 3+ clutch kit for the naturally aspirated Porsche 944 family and its close relatives: the 1983-1989 944, the 944S, the 944S2, the 924S and the 924 Carrera GT. Owners usually land here because the original clutch is slipping in the upper gears, the pedal engagement has moved high, or an engine build, cams or a stroker has pushed torque past what a stock disc can hold. SPEC rates this kit at 476 ft-lb, the highest torque capacity in its single-disc line for these cars.
The 944 places its engine up front and the gearbox in a rear transaxle, linked by a torque tube that carries a long drive shaft. The clutch lives at the engine end. When you release the pedal, the pressure plate clamps the disc to the flywheel and that torque travels back through the torque tube to the transaxle. SPEC builds the Stage 3+ disc with a full-faced carbon semi-metallic lining. Unlike the six-puck Stage 3 (SP313), the full face spreads load over a larger area, which SPEC says gives long life, a high friction coefficient and good drivability. It is suited to street cars that also see autocross or track days.
A 944 clutch job means sliding the transaxle and torque tube rearward, so it pays to be sure. Warm the engine, pick fourth gear near 2,500 rpm and apply full throttle; a tach that climbs without matching road speed confirms slip. Check the clutch fluid level and look for wetness at the slave cylinder and at the bellhousing, since a rear main seal leak will contaminate any new disc. If the problem is a vibration or rumble that changes with road speed rather than engine speed, the torque tube or transaxle may be the cause instead. Our article on symptoms shops often misdiagnose walks through ruling those out, and rebuild vs replace helps if the transaxle needs work too.
SPEC lists SP313F for the Porsche 944 (1983-1988 and 1989), 944S (1987-1988), 944S2 (1989-1991), 924S (1985-1988) and 924 Carrera GT (1981-1985). It is not the kit for the 944 Turbo, which uses its own clutch; see the SPEC 944 Turbo Stage 1 kit. The 968 is also a different application. Because these cars span many years and several engine sizes, match the part number on your current clutch or send us your year and VIN before ordering. Browse more clutch and rebuild kits for other platforms.
| Brand | SPEC |
| Part number | SP313F |
| Fits | Spec Porsche 944 N/A Stage 3+ Clutch Kit |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
SPEC lists the 1983-1989 944, 944S, 944S2, 924S and 924 Carrera GT. It does not fit the 944 Turbo or the 968.
SPEC rates SP313F at 476 ft-lb. For comparison, its Stage 2 kit for the same cars is rated 344 ft-lb and the six-puck Stage 3 is rated 410 ft-lb.
SPEC describes the full-faced carbon semi-metallic disc as drivable and intended for street, drag and autocross use. It engages firmer than a stock organic disc but is smoother than a puck-style clutch.
The kit does not include one. Have the original resurfaced if it is within spec, or fit the SPEC aluminum flywheel for 2.5L and 2.7L cars or the steel flywheel for the 944S and S2.
Inspect and replace as needed the rear main seal, release lever and pivot, release bearing guide, and torque tube bearings. Reaching the clutch is the bulk of the labor, so do it once.
