A/T - G4A-EL/4EAT Repeated Reverse Clutch Failure

TRANSMISSION: G4A-EL/4EAT

BULLETIN: # 040

SUBJECT: Reverse Clutch Failure

DATE: February 1991

MAZDA G4A-EL / FORD 4EAT

Repeated Reverse Clutch Failure

You can help avoid repeated reverse clutch failure on G4A-EL's AND 4EAT's by following three simple steps.

1. Always use factory sealing rings on the pump. Ford rings will work on both units. The part # is E92Z-7D019-A.




2. Drill a .030 hole in the reverse piston. (Figure 1) This is just like the T-35 that would cross leak in the valve body and drag the reverse band. The .030 hole creates an exhaust so the clutch won't come on while driving forward.




3. Enlarge the reverse feed orifice (figure 2) by .020 to compensate for hole you drilled in the piston.

BULLETIN RECAP

^ Use factory rings # E92Z-7D019-A.
^ Drill a .030 hole in the reverse piston.
^ Enlarge the reverse feed by .020.

FOR ADDITIONAL INFORMATION:
August 1990 Bulletin # 021 Sept. Transmission Digest