Just got done doing a full rebuild on a 47re, everything works but the reverse, I have swapped out the valve body so I know its not that and I took a air hose and pressure check the rear servo and that seems to be applying like it should, other things to add when I put it in reverse the engine lugs down like it goes in gear but the wheels will go forward just a little and then stop and are able to be turned by had forward or reverse any Ideas what it could be would be helpful thanks