Stellar Automotive Group 4L40E/5L40E 2nd Coast Clutch Molded Piston fits Cadillac & BMW 2WD

Stellar Automotive Group 4L40E/5L40E 2nd Coast Clutch Molded Piston (2WD Cadillac & BMW) – Compatible for 2000-2010

Stop engine runaway in 2nd gear and burnt 2nd coast clutches with this upgraded molded 2nd coast clutch piston from Stellar Automotive Group (2WD-specific).

This direct-replacement piston is the critical apply component for the 2nd coast clutch pack in RWD/2WD versions of 4L40E and 5L40E transmissions found in Cadillac and BMW models. The factory piston commonly cracks or loses its bond under heat and mileage, causing internal leakage that weakens coast apply — leading to no engine braking in 2nd gear, high RPM overrun when decelerating, and rapid clutch failure. This molded piston with permanently bonded rubber seal restores full coast-down function, delivers smooth engine braking in 2nd gear, and protects your 2nd coast clutch pack for reliable performance.

Perfect fit for popular 2WD models including:

• Cadillac CTS (2004-2010)
• Cadillac SRX (early 2WD)
• BMW 3 Series (E46/E90 2WD), 5 Series (E39/E60 2WD)

Symptoms of a failing 2nd coast piston:

• Engine revs freely when coasting in 2nd gear
• No engine braking in 2nd gear
• Ratcheting noise or slipping on overrun
• Burnt 2nd coast frictions on teardown

Don’t let a $50 piston destroy your 2nd coast pack — install the Stellar Automotive Group molded 2nd coast piston and enjoy controlled deceleration again.

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

Add this essential 4L40E/5L40E 2WD rebuild part to your cart today and feel the engine braking return instantly!