Ok so my transmission has become nearly impossibly to get in gear, but if it does go in the truck will jump forward about an inch or so, the hydrolics are all ne, have the grim joint mod. Yes my firewall is craked and the firewall flexes out about 3/16 to a quater inch out. Do you think this is my only problem or could the clutch be bad also? It never slips or anything, this is the only problem