CLUTCHES

Clutches For Peterbilt Trucks

While automated manual transmissions have taken over much of the new truck market, a large portion of the Peterbilt fleet still runs manual transmissions — and even AMT-equipped trucks have a clutch that wears and requires periodic replacement. We carry clutch assemblies, clutch brakes, release bearings, and related components for Peterbilt trucks running Eaton Fuller, Spicer, and other common manual and automated transmissions.

Frequently asked questions about clutches

How long should a clutch last on a Peterbilt with a manual transmission?

With proper driver technique — avoiding riding the clutch, not using it to hold the truck on grades, and matching revs during downshifts — a quality clutch on a Class 8 truck can last 500,000 miles or more. Aggressive or improper use can dramatically shorten that lifespan. Vocational applications with frequent starts and stops, like refuse or construction, see much shorter clutch intervals than line-haul operations.

What are the signs that a clutch needs to be replaced?

Slipping under load — where engine RPM rises without a corresponding increase in vehicle speed — is the clearest sign of a worn friction disc. Chatter during engagement, difficulty finding gears, or a clutch that requires very high pedal position to engage are also warning signs. A grabbing or shuddering clutch may indicate oil contamination from a rear main seal leak, which needs to be addressed before installing a new clutch.

Do I need to replace the flywheel when replacing the clutch?

Not always, but the flywheel surface should be inspected and measured whenever the clutch is out. Hot spots, deep grooves, or a surface that has worn below the minimum thickness specification require resurfacing or replacement. Installing a new clutch against a worn flywheel will reduce the life of the new clutch considerably, so it's worth the extra step to assess the flywheel condition during the job.

Other parts you might need

Shop transmission parts for Peterbilt trucks