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

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

Eliminate delayed or no reverse, slipping in 1st gear, and burnt low/reverse clutches with this precision molded low/reverse clutch piston from Stellar Automotive Group.

This direct-replacement piston is the critical apply component for the low/reverse clutch pack in all 4L40E and 5L40E transmissions found in BMW models. The factory piston commonly cracks or loses its bond under heat and mileage, causing internal leakage that weakens low/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 rock-solid 1st gear hold, and protects your low/reverse clutch pack for reliable BMW performance.

Perfect fit for popular BMW models including:

• BMW 3 Series (E46/E90)
• BMW 5 Series (E39/E60)
• BMW X3 (E83), X5 (E53)

Symptoms of a failing low/reverse piston:

• Delayed or no reverse engagement
• Slipping or weak 1st gear
• Harsh clunk when reverse grabs
• Burnt low/reverse frictions on teardown

Don’t let a $50 piston destroy a $500 clutch pack — install the Stellar Automotive Group molded low/reverse piston and get reverse & 1st gear back to factory strength.

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 restore confident shifting!