4R44E / 4R55E / 5R55E

A pack with a leaking piston never reaches full clamp, whatever the pressure gauge says.4R55E cover cast zc intermediate overdrive servo (molded) piston. The seals are bonded to the piston...

Bonded pistons fail at the bond line, and the failure is invisible on the bench.4R55E CA cover cast cb intermediate overdrive servo (molded) piston. This set returns the apply circuit...

A cracked or hardened piston seal bleeds off apply pressure and the clutch it feeds slips under load.4R55E cover cast ba bb intermediate overdrive servo (molded) piston. This piston set...

Apply pressure that reads correct at the port can still be lost at the piston.4R55E cover cast fb intermediate overdrive servo (molded) piston. This piston set restores a positive seal...

Lip seals take a set in the groove and stop wiping the bore the way they did when new.4R55E cover cast db intermediate overdrive servo (molded) piston. This piston set...