Stellar Automotive Group 4L40E/5L40E Reverse Clutch Molded Piston fits GM

Stellar Automotive Group 4L40E/5L40E Reverse Clutch Molded Piston – Compatible for GM & BMW 2000-2010

Fix delayed or no reverse, slipping in reverse, and burnt reverse clutches with this upgraded molded reverse clutch piston from Stellar Automotive Group.

This direct-replacement piston is the critical apply component for the reverse clutch pack in all 4L40E and 5L40E transmissions. The factory piston commonly cracks or loses its bond under heat and mileage, causing internal leakage that weakens reverse apply — leading to no reverse, harsh clunks, and rapid clutch failure. This molded piston with permanently bonded rubber seal restores full line pressure, delivers instant, firm reverse engagement, and protects your reverse pack for reliable daily driving or light towing.

Perfect fit for popular models including:

• Chevrolet Trailblazer, SSR
• BMW 3 Series (E46), 5 Series (E39)
• Cadillac CTS (early), Escalade (select)

Symptoms of a failing reverse piston:

• Delayed or no reverse engagement
• Slipping or weak reverse
• Harsh clunk when reverse grabs
• Burnt reverse frictions on teardown

Don’t let a $50 piston destroy a $500 clutch pack — install the Stellar Automotive Group molded reverse piston and get reverse back instantly.

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

Add this essential 4L40E/5L40E rebuild part to your cart today and drive with full confidence!