My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Spec Clutch SB634 Stage 4 Performance Clutch Kit

(2001 BMW Z8)

Manufacturer

Picture for manufacturer Spec Clutch

Part Number

SB634
11 reviews
Sale Price

$567.80

Estimated ship date Wednesday, November 25

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The SPEC SB634 Stage 4 Clutch Kit is a race-grade clutch system engineered for heavily modified engines demanding maximum torque capacity, instantaneous engagement, and reduced rotating mass. As a solid hub evolution of the Stage 3, this kit is purpose-built for competitive motorsports applications where reliability under extreme load is non-negotiable.

Key Features:

  • Solid 8-rivet hub design — a rigid, high-torque hub assembly heat-treated for superior strength and durability under race conditions
  • Carbon semi-metallic friction disc — available in 3, 4, or 6-puck configurations to suit your specific performance needs
  • High clamp pressure plate — maximizes clamping force for aggressive, instantaneous engagement
  • Lightweight construction — reduced rotational mass improves throttle response and rev characteristics
  • SFI Approved — meets SFI safety certification standards for sanctioned motorsports competition
  • Complete kit — includes pressure plate, friction disc, release bearing, and installation tool kit

Puck Configuration Guide:

  • 3-Puck: Lightest option, ideal for maximum weight reduction
  • 4-Puck: Balanced compromise between weight savings and engagement smoothness
  • 6-Puck: Smoothest engagement of the three; marginally street-drivable, though the rigid hub makes it unsuitable for daily driving

Recommended Applications: Drag Racing, Road Racing, Drift, Rallye, Pulling, Circle Track

Installation Note: Unless installing a new SPEC flywheel, the existing flywheel must be resurfaced prior to installation. A minimum 450-mile break-in period of primarily city and stop-and-go driving is required before full-throttle engagement or speed shifting.

Products specifications

Fits

2001 BMW Z8

Torque Capacity

580 ft/lbs

Great deal

I got the part I ordered and will be having someone install it soon looks just fine and I love the chat feature as well.. thinking about buying brake shoes now.. a lot of savings

I just place order... I will wait to mke sure part and service is good..

Great prices & fast shipping.

They had the best price anywhere on the items I ordered(Recon Lights). Prompt emails and accurate tracking via UPS shipping. I'm pleased and will order more items now that I know they're "legit". Thanks Autoplicity!<br><br>Nick C.

GOOD SERVICE, FAST SHIP, CHEAP PRICE

Thought I had an issue with the customer service, and they worked it out PROMPTLY! That's a good customer Service relationship!<br>They even agreed to credit me my shiiping for a slight mistake they made!<br>VERY HAPPY!

Easy to do business with BEST PRICE anywhere!! Shipped and arrived quickly

I ordered this product and Wednesday in the morning and it was on my door step Thursday morning with regular shipping. The ordering process was super easy and the price was $35 cheaper than any other online retailer. The Rack is awesome, easy to assemble took me about 20 minutes by myself, put on my jeep hooked up the bikes and off I went, fantastic design, I highly recommend the Rola NV2 bike rack and highly recommend Autoplicity

Not sure if they overlooked my order but I didn't get my shipping info (3 days after ordered) until I emailed asking for status update. I received a response the following day and all my items ordered came 2 days later...much faster than I had anticipated considering the "delay" or lack thereof (5 days total). Long story short...items are as described, best prices (from what I can researched online for same items/brand) and resonable shipping prices. the selection and brand(s) offered were somewhat limited for my specific needs, otherwise I would've ordered more.

I was trying to locate a hi volocity radiator fan and for it at Autoplicity at a very good price. The item was shipped fairly quickly concidering it most likely had to come from the manufacturer. Thanks for your help.

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy