Spec 15-17 Ford Mustang Shelby GT350 5.2L SS-Trim Twin Disc Clutch Kit
A Shelby GT350 that has been supercharged, sprayed or simply flogged at track days eventually finds the limit of its original clutch. If your car flares rpm on a full throttle upshift, smells hot after a session, or the bite point has moved to the top of the pedal, SPEC SFGT3SST is a Super Twin twin disc clutch in SPEC's SS-Trim, built for the 5.2L flat plane crank Voodoo V8. SPEC lists it at 1,214 ft-lb of torque capacity, far beyond anything a street GT350 will make.
Stock, the Voodoo makes 526 hp at 7,500 rpm and 429 lb-ft at 4,750 rpm, and every GT350 puts it through a TREMEC TR-3160 six-speed. That high rev ceiling is hard on a clutch, because each upshift dumps a lot of rotating energy into the friction surfaces. A twin disc design divides the work between two discs under one pressure plate, so the assembly holds more torque and handles heat better without needing a huge pedal or a larger diameter. SPEC builds the Super Twin for street and track cars in the 700 to 1,500 ft-lb range and describes it as offering near-stock drivability, long life, a bolt-in install with no shimming or setup, and maintenance free operation.
SPEC lists the SFGT3SST assembly at 46 lb. Compare that with single disc upgrades in our twin disc vs single disc guide if you are deciding how much clutch your build really needs.
Separate clutch slip from release problems first. A soft pedal, a leaking slave or air in the hydraulic line can stop the clutch from fully releasing, which shows up as grinding into gear and is not fixed by new friction. Then do a controlled high gear roll-on and watch rpm against speed. Our clutch slipping guide lays out both tests. If you are also fighting notchy or grinding shifts, read our TREMEC TR-3160 problems guide, because synchro wear in the gearbox is a separate repair. For labor costs, see automatic vs manual repair cost.
Our listing calls out the 2015-2017 Ford Mustang Shelby GT350 with the 5.2L. SPEC's own product page for SFGT3SST lists the Ford GT350 Shelby from 2015 through 2022 in its application range, so later GT350 model years should match too. It is not for the 5.0L Coyote Mustang GT or the GT500. If your car is a GT350R, has an aftermarket bellhousing, or has been swapped to a different gearbox, send us the year and VIN before ordering. Another twin disc option for the same car is the McLeod RXT twin for the GT350, and more clutch parts are in our rebuild kits category.
| Brand | SPEC |
| Part number | SFGT3SST |
| Fits | Spec 15-17 Ford Mustang Shelby GT350 5.2L SS-Trim Twin Disc Clutch Kit |
| Vehicle fitment | Ford Mustang Shelby Gt350 (2015-2017) |
| Type | Clutch Kits - Multi |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Our listing says 2015-2017, but SPEC's product page lists the GT350 Shelby from 2015 through 2022, which covers the later cars. Send us your VIN if you want it confirmed.
SPEC rates this SS-Trim Super Twin at 1,214 ft-lb, which leaves plenty of margin for a supercharged Voodoo.
SPEC designs the Super Twin for near-stock drivability. Expect more mechanical noise than a factory clutch, but traffic and parking lots are manageable.
No. The kit is for the GT350 5.2L Voodoo with its TR-3160 gearbox. The Coyote GT and the GT500 use different clutch hardware.
Replace the pilot bearing and flywheel bolts, check the slave and release bearing for leaks, and flush the clutch hydraulics with fresh fluid.
