C3/A4LD/4R44E/5R55E Servo Piston fits Ford 78-Up

Stellar Automotive Group C3/A4LD/4R44E/4R55E/5R55E Intermediate & Overdrive Servo Piston (Molded, 1.845" ID) – Compatible for Ford 1978-Up

Fix harsh 2-3 or 3-4 shifts, delayed band apply, and burnt intermediate/overdrive bands with this upgraded molded servo piston from Stellar Automotive Group.

The factory cast piston with separate lip seal is notorious for cracking, hardening, and leaking — causing weak or no band apply in 2nd, 3rd, and overdrive gears. This direct-replacement molded piston (1.845" ID) features a permanently bonded rubber sealing lip that stays soft and leak-free for decades, restoring instant, firm servo engagement every time. Ideal for high-mileage Rangers, Explorers, and Aerostars.

Perfect fit for popular models including:

• Ford Ranger, Explorer, Aerostar, Bronco II
• Mercury Mountaineer
• Mazda B-Series
• All C3, A4LD, 4R44E, 4R55E, 5R55E applications (1978-Current)

Symptoms of a bad servo piston:

• Harsh or delayed 2-3 or 3-4 upshift
• Slipping or no overdrive engagement
• Burnt intermediate or overdrive band on teardown
• Servo cover leakage

Don’t fight old servo seals any longer — upgrade to the modern molded design and make your shifts crisp and reliable again.

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

Add this must-have servo upgrade to your cart today and feel the difference on every upshift!