Fresh rebuilt trans did it myself so open to any suggestions on where i may have made a mistake. I put it all back together tv cable adjusted correctly and fluids topped off. The problem arises when trans warms up a lil and you try to shift from N or P to either the OD position Or the R position, The trans slams into R or OD and stalls out the car every time. You can shift to 3rd at a stop fine and the car will shift 1st,2nd and 3rd nice and strong. i really do not know what could be the source of the problem i put the mega monster in a box kit in. Any help would be greatly appreciated

 

please anyone? any suggestions i really have no idea and really dont know where to start