Spec 05-06 Volvo S40 T5 2.5L/04-07 S60R 2.5L/04-07 V70R 2.5L Stage 2+ Sprung Clutch Kit
The SPEC SO603HS is for Volvo owners whose turbo five-cylinder now makes more torque than a stock or Stage 1 clutch can hold: the 2005-2006 S40 T5 and the 2004-2007 S60R and V70R named in our listing. Typical signs are a tach needle that jumps in the upper gears under full boost, a pedal that bites higher than it used to, and a clutch that smells after a few hard pulls. Before you order, read the flywheel section below. This kit is designed around a SPEC billet single-mass flywheel, and that changes what you need to buy.
SPEC builds its clutches in numbered stages. Its Stage 2 uses a Kevlar disc with steel backing, and SPEC describes Stage 2+ as a multi-friction disc that keeps the Stage 2 drivability but adds 15 to 20 percent more torque capacity. SPEC lists SO603HS in its Stage 2 Plus category with a torque rating of 545 ft-lb and a shipping weight of 15 lb. For comparison, SPEC rates its Stage 1 Volvo kit, SO601, at 430 ft-lb.
The disc in this kit has a sprung hub. On the S60R and V70R, which are all-wheel drive, the hub springs take some of the shock out of a hard launch before it reaches the gearbox, angle gear and rear coupling. On a front-drive S40 T5 the springs mainly help with smoother takeoffs and less gear rattle.
If the car is stock or nearly stock, a clutch this strong is more than you need, and the SPEC Stage 1 kit SO601, which SPEC lists for use with the factory dual-mass flywheel, is the simpler job.
Pick a high gear at low rpm and go to full throttle on a safe, empty road. A tachometer that rises faster than road speed means slip. Rule out a boost leak, fueling fault or misfire first by scanning for codes, since an engine that falls flat can feel like a clutch that lets go. Also check the clutch hydraulics for air or a leaking slave, which causes drag and grinding rather than slip. Our manual vs automatic repair cost guide helps you estimate shop labor for the swap.
Our listing names the 2005-2006 Volvo S40 T5 2.5L and the 2004-2007 S60R and V70R 2.5L, all with the six-speed manual. SPEC's own application list for SO603HS also includes the S40 T5 six-speed through 2010 and the S60 T5 six-speed from 2004-2008. On every one of those rows SPEC states the kit is a non-ratcheting kit for use with a SPEC billet flywheel, and for the S60R and V70R it says for use only with the SPEC billet single-mass flywheel. SPEC's matching flywheel for this kit is part number SO60S. Note that the SPEC Volvo steel flywheel we list, SO60S-O, is the version SPEC makes for the stock clutch, so it is not the partner for this kit. If you are unsure, send us your year, model and VIN before ordering and we will confirm the correct flywheel. For a street-focused alternative from another maker, see the XClutch Stage 1 organic kit or the track-oriented XClutch Stage 2R ceramic kit for the S40 T5.
A single-mass flywheel transmits more engine pulses than the factory dual-mass unit, so some extra gear rattle at idle is normal after this conversion and is not a fault.
| Brand | SPEC |
| Part number | SO603HS |
| Fits | Spec 05-06 Volvo S40 T5 2.5L/04-07 S60R 2.5L/04-07 V70R 2.5L Stage 2+ Sprung Clutch Kit |
| Vehicle fitment | Volvo S40 T5 2.5L/04-07 S60R (2005-2006) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
SPEC lists this kit for use with a SPEC billet flywheel, and for the S60R and V70R it says for use only with the SPEC billet single-mass flywheel. SPEC's matching flywheel is SO60S. If you want to keep the dual-mass flywheel, SPEC's Stage 1 SO601 is the kit it lists for that setup.
SPEC rates SO603HS at 545 ft-lb. Its Stage 1 Volvo kit is rated at 430 ft-lb, so the Stage 2+ is the step for cars with hardware upgrades, not just a light tune.
Our listing names the 2005-2006 S40 T5. SPEC's own application list shows SO603HS for the S40 T5 six-speed through 2010. Send us your VIN and we will confirm it against your car before shipping.
SPEC describes Stage 2+ as keeping the drivability of its Stage 2 Kevlar clutch while adding torque capacity, and this disc has a sprung hub. It engages more firmly than stock, and the single-mass flywheel adds some idle rattle, but it is intended for street use.
The flywheel (SPEC billet unit), flywheel bolts, release and pilot bearings, any leaking seals, and the clutch fluid. Inspect the slave cylinder while the gearbox is out.
