Gearbox problem?

[mread4]

When i have been driving my FD for a while the gearbox jumps about on pull off. It\'s not the diff as I just replaced it and changed it\'s mounts to solid rubber ones. Would a gearbox brace stop it from jumping?

[Doughnut]

if its not ur diff mounts its prob ur powerplant frame thats cracked did u inspect it b4 u put it back on

[mread4]

No I didn\'t think to check that. It only jumps when driving for a while could it still be the poerplant frame?