My sister has a 1998 Audi A4 (automatic transmission). She tells me that there is a acceleration problem. The engine will rev to the moon then all of a sudden the gear will catch and away she goes. I was thinking the problem was either the torque converter of the tranny itself. Havent checked the fluid, however i can only imagine that its still at proper level and condition due to an engine swap a few months ago. Maybe a pressure problem to the servos? what do you think?

SOUND LIKE TRANSMISSION SLIPPING. CHECK TRANSMISSION FLUID LEVEL.IF FLUID LEVEL OKAY BUT FLUID LOOKS DARK SMELL BURNT.CHANGE TRANSMISSION FLUID AND FILTER ADD SOME VALVE BODY TREATMENT TO LOOSEN STICKEN SHIFT VALVES.ADD TO TRANSMISSION FLUID DONT OVER FILL TRANSMISSION WILL CAUSE OVERHEAT. IF TRANSMISSION FLUID GOOD FILTER ALREADY BEEN CHANGED.IF ALL GOOD ENGINE BEEN TUNED UP OTHER POSSIBLE CAUSES FOR TRANSMISSION SLIPPING NOT GOING TO OVER DRIVE COULD BE THROTTLE SHIFT CABLE OUT ADJUSTMENT OR STRETCHED. TORQUE CONVERTER FAULTY OR SHIFT VALVES TO TORQUE CONVERTER OR OVER DRIVE STUCK IN VALVE BODY. VALVE BODY FAULTY. AND HAVE VECHICLE SCANNED FOR FAULTY VECHICLE SPEED SENSOR OR FAULTY THROTTLE CONTROL MODULE OR FAULTY THROTTLE POSITION SENSOR. THEY WILL EFFECT TRANSMISSION SHIFT TO OVER DRIVE IF FAULTY.