ACT 1998 Chevrolet Camaro Twin Disc HD Street Kit Clutch Kit
1998 was the first year the Camaro Z28 and SS got the LS1, and many of those cars now carry cams, heads, nitrous or boost that the original single-disc clutch behind the T-56 six-speed was never meant to hold. The usual complaints are a clutch that slips on a hard shift into second or third, a heavy pedal from an aftermarket single disc, or a disc that is simply worn out after decades of use. ACT part number T1S-G05 is the Twin Disc Heavy Duty Street kit for the LS1 F-body, and it includes ACT's Streetlite flywheel.
Two 10.5 inch (267 mm) discs and a floater share one pressure plate, which doubles the friction surface. ACT rates T1S-G05 at 891 ft-lb at the crank, 86 percent over the original clutch, and the extra surface area also spreads heat for longer disc life. The discs are rigid-hub street discs with a high-copper organic lining on a steel backing, riding on a heat-treated chrome-moly hub for the 1.125 inch T-56 input shaft. ACT describes the feel as light pedal effort with smooth engagement and OE to mild gear rattle, which is the main reason to pick a twin over a single disc of similar capacity.
ACT's Positive Lift Floater System lifts the middle plate on release without posts, so there is no floater rattle and no posts to wear, and the design adjusts for disc wear and releases both discs evenly. ACT says its twin kits include the pressure plate, two discs, floater, a CNC machined and balanced flywheel and an alignment tool, and that some kits also include bearings. This kit uses the Streetlite flywheel, weighs 45.8 lb and carries an SFI 1.2 rating.
On an LS1 F-body, rule out the hydraulics first. A pedal that goes soft when hot, a slow return, or hard shifts with the engine running but easy shifts with it off point to the slave or master cylinder and the line, not the discs. To check slip, hold fourth gear and roll into the throttle from around 2,500 rpm; if rpm rises faster than road speed, the clutch is slipping. Our slipping diagnosis guide covers the test, and the manual versus automatic repair cost guide helps when you are budgeting the job.
Our listing is cataloged for the 1998 Chevrolet Camaro. ACT's chart lists T1S-G05 for the 1998-2002 Camaro Z28 and SS and Firebird Formula and Trans Am, plus 1997-2013 Corvettes, the 2004-2006 GTO and the 2010-2015 Camaro SS and Z/28. Hydraulic release parts, bellhousings and starters differ across that range, so match your engine and transmission and send your year and VIN if you are not sure. Only manual cars apply. If you want a single disc instead, see the ACT GM9-HDG6 single disc, or compare the ACT Mod-Twin 10.5 XX for higher power levels.
Break in the organic discs for 300 to 500 miles of easy driving before any launches, as ACT recommends. ACT also lists 15 to 40 percent more pedal effort for its Heavy Duty pressure plates than stock.
| Brand | ACT |
| Part number | T1S-G05 |
| Fits | ACT 1998 Chevrolet Camaro Twin Disc HD Street Kit Clutch Kit |
| Vehicle fitment | Chevrolet Camaro (1998) |
| Type | Clutch Kits - Multi |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
ACT's chart lists it for 1998-2002 Camaro Z28 and SS and Firebird Formula and Trans Am with the 5.7L LS1 and six-speed manual. Our listing is cataloged for 1998, so send your VIN if you want us to double check another year.
Yes. ACT notes this kit includes its Streetlite flywheel, along with the pressure plate, two discs, floater and alignment tool.
ACT rates T1S-G05 at 891 ft-lb at the crank, 86 percent over the original clutch.
ACT describes the feel as light pedal effort with smooth engagement. Its Heavy Duty pressure plates can add 15 to 40 percent pedal effort over stock depending on the car.
Yes. ACT recommends 300 to 500 miles of mild engagement for organic street discs before racing or hard launches.
