i have a 84 f150 with a c6 it has no reverse and when you put it in park it acts like it loads the motor only goes to about 1500 rpm and in nuetral it trys to go forword need help with it

 

Get under the truck and inspect the linkage. Make sure it goes in all the gear selections.

 

The forward clutch has welded the clutches to the steel plates.

When you have it reverse the forward clutch cant release and it tries to pull forward and reverse at the same time.

When its in park the parking paw wont let it move and the forward clutch is trying to pull forward, like power braking it.

I bet you could drive it in neutral.

Sorry the trans is toast and will have to be rebuilt.