Clutch Masters 2JZ/1JZ to GM T-56 Transmission FX850 Twin-Disc Clutch Kit

Bolting a Toyota 1JZ or 2JZ to a GM T-56 six-speed is one of the most common big-power swaps for Supras, Lexus chassis and drift cars, and the stock-style single disc is usually the first thing to give up once the boost goes up. Clutch Masters part number 16173-TD8R-SVH is built for exactly that combination: an FX850 twin disc clutch in the Race stage, matched to the Toyota crank on one side and the T-56 input shaft on the other, with a steel flywheel and a hydraulic release bearing in the box. If your swap slips in third and fourth at full boost, or you are building the drivetrain before the first start-up, this is the kit to look at.

What the FX850 twin disc does in a JZ to T-56 swap

The FX850 is an 8.5 inch (216 mm) two-disc clutch. Clutch Masters designed it for engine and transmission combinations with tighter bellhousings, and it gets its holding power by doubling the friction surfaces rather than by going to a bigger diameter. In the Race version (the TD8R in the part number) a sprung ceramic disc is paired directly with a second ceramic disc, so it bites hard and holds a lot of torque, while the sprung hub still takes some shock out of the driveline. The cover is machined from billet aluminum and Type 3 hard anodized, and Clutch Masters says it flexes about .003 inch where a cast or stamped cover can flex .030 inch, which keeps the release point consistent. Its QR quick-release pressure plate uses three spring-loaded bolts to help the plate release evenly and cut internal noise. The steel flywheel is machined from a 1045 billet core and black oxide coated.

Symptoms that say your swap needs more clutch

• RPM climbs without the car pulling harder once the turbo comes on boost
• Slip that started right after a bigger turbo, more boost or a new tune
• Burnt friction smell after a launch, a drift run or a dyno pull
• Chatter or shudder from a glazed or heat-checked single disc
• A release point that keeps moving as the clutch gets hot

How to confirm before you buy

Do a slip test in fourth gear from low rpm at full throttle and watch whether engine speed rises faster than road speed. Rule out the hydraulics first: a leaking or poorly bled release bearing, or a bearing set too close to the fingers, will hold the clutch partly open and look like slip. Then be honest about use. Clutch Masters says driving style and purpose matter more than a torque number, and a race clutch on a mostly street car wears fast and is tiring in traffic. For a primarily street car, compare the organic-faced McLeod RST twin for 2JZ to T56. Our manual versus automatic repair cost guide helps you plan the labor side.

Fitment

This kit is for a Toyota 1JZ or 2JZ engine mated to a GM T-56 six-speed. It is a swap part, so it does not fit a factory Supra with the V160 or W58, and the listing does not include a bellhousing or adapter plate, so plan on the adapter your swap uses. T-56 versions differ in input shaft spline; competing 2JZ-to-T56 kits are even sold in separate 26 and 24 spline versions, such as the McLeod RXT HD 24 spline kit. Tell us which T-56 you have and the input spline count before you order so we can confirm the disc hub. More clutch and drivetrain parts are in our rebuild kits department.

Install notes

• Use the supplied Clutch Masters steel flywheel with new bolts and the torque the instructions give; do not mix this pressure plate with another flywheel.
• Stack the discs and floater in the order shown in the instructions, center them with an alignment tool such as our 18-piece clutch alignment kit, and draw the cover down evenly in a crisscross pattern.
• Set the hydraulic release bearing height to the clearance in the instructions for your bellhousing and adapter stack, then bleed the line until the pedal is firm.
• Expect pedal effort to rise; Clutch Masters puts the FX850 average at about 50 percent more pressure than stock, so check your master cylinder and pedal mounts.
• Break it in for at least 500 miles of normal stop-and-go driving with no full-throttle shifts or compression braking.

Does this kit fit a stock 1993-1998 Supra?

No. It is built for a 1JZ or 2JZ engine bolted to a GM T-56 six-speed. A factory Supra with the V160 or W58 needs a kit made for that transmission.

Is a bellhousing or adapter plate included?

The kit includes the twin disc clutch, a steel flywheel and a hydraulic release bearing. A bellhousing or adapter is not listed, so use the one made for your swap.

Which T-56 input spline does it take?

T-56 units are not all the same, and 2JZ swap kits are sold in different spline versions. Send us your T-56 type and input spline count and we will confirm the disc hub before it ships.

What is the difference between Race and Street FX850?

Clutch Masters builds the Street stage with a sprung ceramic disc paired to a rigid fiber disc. The Race stage on this kit uses a sprung ceramic disc paired to a second ceramic disc, which grabs harder and suits high boost and track use.

Will it rattle or make noise?

Twin disc clutches can make some noise at idle with the clutch engaged. The QR pressure plate is designed to cut that internal noise, but some sound is normal for this type of clutch.

How do I break it in?

Drive at least 500 miles of normal stop-and-go driving with no full-throttle shifting or compression braking so the friction faces seat to the flywheel and pressure plate.

• Automatic vs. Manual Transmission Repair Cost: What to Actually Expect