A/T - A4LD No Movement After Rebuild

TRANSMISSION: A4LD

BULLETIN: # 066

SUBJECT: No Movement

APPLICATION: Ford

DATE: August 1991

No Movement After Rebuild




An A4LD that won't move after rebuild could be caused by no torque converter charge. The first thing to check is line pressure. If the line pressure is high you might have the wrong modulator or the modulator valve might be stuck. Figure 1 shows how to I.D. an A4LD modulator.




If line pressure is normal, check to see if the transmission is pumping oil out to the cooler. Remove the outgoing cooler line (the bottom line) and see how much oil flows out with the engine running. You should get about one quart in 15-20 seconds. No oil to the cooler would indicate no torque converter charge. To correct this, drill a .040"-.060" hole in the valve body as shown in figure 2. Drilling this hole lets line pressure feed directly into the torque converter charge circuit.

FOR ADDITIONAL INFORMATION: TSB 86-57

BULLETIN RECAP

^ Check for high line pressure
^ Check cooler flow
^ Make sure you're not using a C-3 modulator
^ Drill the valve body with a .040-060 drill