4L40E/5L40E Direct Clutch Molded Piston fits GM

4L40E/5L40E Direct Clutch Molded Piston – Compatible for GM & BMW 2000-2010

Stop slipping in 3rd-4th gears, delayed upshifts, and burnt direct clutches with this upgraded molded direct clutch piston from Stellar Automotive Group.

This direct-replacement piston is the critical apply component for the direct 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 direct apply — leading to flare on upshifts, slipping under load, and rapid clutch failure. This molded piston with permanently bonded rubber seal restores full line pressure, delivers crisp 3rd-to-4th transitions, and protects your direct clutch 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 direct clutch piston:

• Flare or slip on 3-4 upshift
• Delayed engagement in direct gear
• Harsh shifts when clutches finally grab
• Burnt direct frictions on teardown

Don’t let a $50 piston destroy a $500 clutch pack — install the Stellar Automotive Group molded direct piston and shift strong through every gear.

Add this essential 4L40E/5L40E rebuild part to your cart today and enjoy crisp, reliable shifts!