Stellar Automotive Group 1000/2000/2400 C3/C4 Bonded Piston fits Allison 00-Up

Stellar Automotive Group 1000/2000/2400 C3 & C4 Clutch Bonded Piston – Compatible for Allison 2000-Up

Stop slipping in 3rd-6th gears and burnt C3/C4 clutches with this precision bonded piston from Stellar Automotive Group.

This direct-replacement piston is used for both the C3 (3rd/4th) and C4 (4th/5th/6th) clutch packs in all Allison 1000, 2000, and 2400 series transmissions from 2000 onward. The factory piston commonly cracks or loses its bond under heavy towing and diesel torque, causing internal leakage that weakens clutch apply — leading to flare on upshifts, slipping under load, and rapid friction failure. This upgraded molded piston with permanently bonded rubber seal restores full line pressure, delivers lightning-fast shifts, and protects your clutches even in severe-duty applications.

Perfect fit for popular Allison-equipped models including:

• Chevrolet/GMC Silverado/Sierra 2500HD/3500HD (Duramax)
• Ram 3500 (Cummins with Allison)
• Medium-duty trucks, motorhomes, commercial vehicles

Symptoms of a failing C3/C4 piston:

• Flare or slip on 3-4 or 4-5 upshifts
• Delayed engagement in mid/higher gears
• Burnt C3 or C4 frictions on teardown
• Harsh shifts when clutches finally grab

Don’t let a $60 piston destroy a $800 clutch pack — install the Stellar Automotive Group bonded C3/C4 piston and rebuild for the long haul.

Note: All parts are distributed, not designed or manufactured, by Stellar Automotive Group.

Add this critical Allison 1000/2000/2400 component to your cart today and shift strong under any load!