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Slipper Clutch Rebuilding & Setup

Precision clutch setup. Smooth power delivery.

Incorrect clutch setup is the #1 reason race transmissions fail. We specialize in rebuilding and properly setting up Crower and Atlas 12.5″ slipper clutches for semi-truck race applications.
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Expert Rebuilding

Crower & Atlas 12.5" clutch specialists.

Correct Setup

Eliminate drivetrain shock and component failure.

Race Proven

Trusted by top teams across North America.

Max Performance

Smoother engagement. More power to the ground.

Slipper Clutch Rebuilding & Setup

We specialize in rebuilding and precisely setting up high-performance slipper clutches for competitive semi-truck racing applications. Our experience includes Crower and Atlas clutch systems designed to manage extreme horsepower and torque. Each clutch is carefully inspected, rebuilt, adjusted, and configured to match the truck’s power level, drivetrain setup, and racing requirements. Proper setup helps control engagement, reduce damaging drivetrain shock, improve launch consistency, maintain dependable slip control, and deliver reliable performance throughout demanding race conditions.

Because every racing setup responds differently, we consider engine output, gearing, truck weight, track conditions, launch characteristics, and the driver’s performance goals before finalizing the clutch setup. This application-specific approach helps create predictable engagement and repeatable performance while protecting critical transmission and driveline components from unnecessary stress during hard launches and high-load operation.

Crower & Atlas 12.5" Slipper Clutches

We rebuild and correctly set up the most popular high-performance clutch systems used in semi-truck racing.
  • 12.5" 3 & 4 Disc Clutches
  • High Horsepower Rated
  • Adjustable Engagement
  • Race Proven Reliability
Slipper clutch rebuilding and precision setup for Crower and Atlas 12.5-inch racing clutches
  • 12.5" 3 Disc Clutches
  • Built for Extreme Torque
  • Consistent Slip Control
  • Long Lasting Performance
Slipper clutch rebuilding and precision setup for Crower and Atlas 12.5-inch racing clutches

Why Clutch Setup Matters

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Prevents Drivetrain Shock

Improper settings shock the transmission, gears, shafts, and rearend.

Reduces Heat & Wear

Correct engagement reduces heat, wear, and extends component life.

Better Power Transfer

Smooth engagement puts more power to the ground and improves ET and MPH.

Protects Your Investment

A properly set clutch protects your drivetrain and saves you money.

Crower & Atlas 12.5" Slipper Clutches

Disassemble & Inspect

Complete teardown and inspection of all components.

Clean & Recondition

All parts are cleaned, measured, and evaluated.

Replace & Upgrade

Worn components replaced with premium parts.

Precision Setup

Clutch is set up for your exact application and goals.

Test & Verify

Checked for proper engagement and smooth operation.

Ready to Win

Built right. Set up right. Back on the track.

Information We Need From You

  • Truck make, model, year
  • Engine RPM operating range (maximum RPM it makes power, lowest RPM it can handle)
  • Type of racing (drag, hill climb, sled, etc.)
  • Loaded or bobtail?
  • Current clutch type & brand
  • Transmission model & ratios
  • Rear gear ratio
  • Tire size
  • Current shift RPM
  • What issues are you experiencing?
  • What performance are you trying to achieve?

Shipping or Drop-Off

We accept clutches shipped to our shop from across the U.S. and Canada.
Contact us before shipping.

Frequently Asked Questions

What is a slipper clutch?
A slipper clutch controls how power is transferred from the engine to the drivetrain. By allowing controlled slip during engagement, it helps reduce drivetrain shock, improve traction, and deliver smoother, more consistent power.
Do you rebuild Crower clutches?
Yes. We rebuild, inspect, recondition, and precisely set up Crower 12.5-inch 3- and 4-disc slipper clutches for high-horsepower semi-truck racing applications.
Do you rebuild Atlas clutches?
Yes. We rebuild and set up Atlas 12.5-inch 3-disc slipper clutches for extreme-torque semi-truck racing applications, with an emphasis on consistent slip control and reliable performance.
Can incorrect clutch setup damage a race transmission?
Yes. Improper clutch engagement can shock the transmission, gears, shafts, bearings, and rear end. It can also create excessive heat and wear, leading to premature component failure. A properly calibrated setup protects the drivetrain while improving power transfer.
What information should I send with my clutch?
Please include your truck’s make, model, and year; engine and horsepower; type of racing; loaded or bobtail configuration; current clutch type and brand; transmission model and ratios; rear differential ratio; tire size; current shift RPM; the problems you are experiencing; and the performance result you want to achieve.
Can you help determine why my drivetrain is being shocked?
Yes. We evaluate your clutch setup together with your engine power, transmission ratios, rear gearing, tire size, shift RPM, racing discipline, and truck configuration to identify what may be causing the shock and recommend the correct setup.
Do you service automotive racing clutches?
No. We specialize exclusively in slipper clutches for semi-truck racing and heavy-duty applications. We do not service automotive or passenger-vehicle racing clutches.

Not an Automotive Shop

We focus 100% on semi-truck racing and heavy-duty applications.

Let's build you a clutch that performs.

Tell Jimmy about your build today.
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