727 No forward or reverse

Bad1Cuda said

The tang on the shift detent lever is engaged properly. This is what I have tried so far. Adjusted both kickdown band and low reverse band. Air tested Front clutch and rear clutch could hear both engaging. Air tested kickdown and low reverse servos. Adjusted line pressure and throttle pressure. After doing all of that last weekend, I refilled transmission and it still doesn't move wheels until around 3000 rpms in both forward and reverse. Removed transmission yesterday thinking it may be pump. Thanks for the speedy replies.

Click to expand...

How does the pump look? Pumps can get weak if the gears are worn or the pocket they sit in is scored and worn but I've never actually seen one completely quit except when the torque converter tabs break off. Even a weak pump put out enough to make it run through the gears fine when the wheels are off the ground. I'd pull the valve body apart and see if there's debris blocking the line pressure valve. In fact I'd check everything in the valve body since you said both clutches air tested ok.

What about the torque converter? Is it the correct one and known to be good (new doesn't always mean good btw). I've seen converters break internally and when that happens you lose all motion