Techical Bullieten

[73challenger_jm]

Does anybody know wut the techical bullieten we have a 73 challenger with a 904 and no fwd gears.

[JVMopar]

I'm looking at the diagnostic chart here and this is what it could possibly be for no forward gears.

Hydraulic pressure too low
Valve body malfunction or leakage
low fluid level
Worn or broken input shaft seal rings
overrunning clutch not holding
overrunning clutch broken or siezed
planetary gear sets broken or siezed
worn or faulty rear clutch

I'd drop the pan and look for debris in the oil pan. If you don't see anything I'd remove the valve body take it apart clean everything put it back together. Give the pressure regulator a couple of turns. Replace the filter and fluid then see what happens. If you do find stuff in the pan like brass metal shavings or hard parts it's gonna need a rebuild.