I have a 1991 F-150 302 and I have just rebuilt the transmission and she runs fine except for a wierd thing it does. If I put the trans in reverse with my foot on the brake it dies. If I put it in reverse with no brake applied it runs fine. Also tried this with the rearend off the ground. Same results and if I try to apply the brake to slow the wheels it will choke and studder until it dies. I can slowly push brake and make it studder then let off and it goes bake to running normal. Fluid level is fine. All this happens once it gets up to temp. Doesn't happen cold at first start up. Will do it in drive once you run down the road a bit sometimes when stopping for a light or something. Only stalls when brake is applied putting a load on the trandsmiision like the converter is locked up when shouldn't be. It is a new converter. Checked codes coming from trans and got no codes. Read somewhere fluid could be leaking across a gasket somewhere engaging the converter. Anybody know what gasket....valve body or pump? Any ideas?