Spec 05-06 Volvo S40 T5 2.5L / 04-07 S60R 2.5L / 04-07 V70R 2.5L Stage 1 Clutch Kit
The Spec SO601 is the mildest performance clutch Spec builds for the turbocharged 2.5-liter Volvo five-cylinder: a Stage 1 kit for the 2004-2007 S60R and V70R, listed here for the 2005-2006 S40 T5 as well. It is the clutch for an owner whose factory clutch has started to slip on boost, or who has added a modest tune and wants a stock-feeling pedal with more holding power, not a race part. If your R flares in fifth or sixth when the turbo comes on, or the original clutch is simply worn out at high mileage, this is the street-first replacement.
Spec describes its Stage 1 disc as a molded, high-performance organic lining built for smooth engagement and long life. Organic friction behaves much like the factory facing, so takeoff, slipping the clutch in traffic and parking-lot moves feel familiar. The added capacity comes from the clamp load and lining together: Spec's application chart for the S60R rates SO601 at 430 lb-ft of torque capacity. For comparison, the same chart lists the Stage 2+ (SO603H) at 545 and the full-metallic Stage 5 at 820, which tells you where Stage 1 sits: enough margin for a stock or lightly tuned car, without the grab and chatter of puck or metallic discs.
Spec lists this kit as non-ratcheting and built for use with the OE dual mass flywheel or any billet flywheel made for the OE clutch. Non-ratcheting means the pressure plate does not use the self-adjusting mechanism found on many factory European clutches, so pedal feel stays consistent instead of changing as the adjuster walks.
Clutch slip never sets a trouble code by itself. Misfires, boost leaks and fueling faults can feel like a soft pull, so scan the engine and fix any codes before you condemn the clutch.
Do a controlled full-throttle pull in fifth from around 2,500 rpm on a safe road. If the tachometer climbs faster than road speed as boost arrives, the clutch is slipping. Also check the hydraulics: a leaking slave or old, moisture-loaded fluid can hold the clutch partly released and mimic slip. Then be honest about power. Stage 1 suits stock and mildly modified cars; if the car already makes big torque, the Spec Stage 2+ sprung kit or the XClutch Stage 1 organic kit are the other options for these cars. Labor is the big number on this job, and our manual versus automatic repair cost guide explains what a clutch replacement typically involves.
Spec's own catalog lists SO601 for the 2004-2007 Volvo S60R and 2004-2007 V70R. This listing also names the 2005-2006 S40 T5 2.5L. The S40 rides on a different platform from the S60R and V70R, so do not assume every clutch interchanges: compare the disc diameter, spline and flywheel style against your old parts, or send us the year and VIN and we will confirm before it ships. The kit is for manual cars only; automatic R models and non-turbo engines cannot use it.
| Brand | SPEC |
| Part number | SO601 |
| Fits | Spec 05-06 Volvo S40 T5 2.5L / 04-07 S60R 2.5L / 04-07 V70R 2.5L Stage 1 Clutch Kit |
| Vehicle fitment | Volvo S40 T5 (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.
This listing includes the 2005-2006 S40 T5 2.5L, but Spec's own catalog lists SO601 for the 2004-2007 S60R and V70R. Because the S40 is a different platform, compare your old disc and flywheel or send us the year and VIN so we can confirm before shipping.
Spec's application chart for the 2004-2007 S60R rates SO601 at 430 lb-ft of torque capacity. If your car makes more than that, look at the Stage 2+ (rated 545) or a higher stage.
Spec built this non-ratcheting kit for use with the OE dual mass flywheel or a billet flywheel made for the OE clutch. Reuse the factory flywheel only if it has no play, rattle or heat damage; otherwise replace it.
Stage 1 is Spec's street-focused organic option, designed for smooth engagement. Expect a feel close to stock, which is the main reason to pick it over higher stages for a daily driver.
The clutch hydraulics run on brake fluid. Use the grade printed on your reservoir cap or in the owner's manual, never mix in silicone DOT 5, and bleed the slave cylinder after the gearbox goes back in.
