1970 Mach I FMX Help!

[Nemesis67]

1970 Mustang Mach I with an original FMX transmission... Problem is whenever I put the car into reverse the car goes forward. What would cause this? By the way the car goes forward in 1, 2, and Drive. Help!

 

[D.Hearne]

Sounds like time to rebuild it, but I'm not an automatic transmission expert. Is it full of fluid ?

 

[Nemesis67]

Yep its got fluid. Didn't need to hear about a possible rebuild.
Anyone know a good transmission shop in Las Vegas?

 

[D.Hearne]

The good news is an FMX is tougher than a C-4. So you'll only be doing this once.

 

[mudbilly]

is the shifter lever actually moving the tranny into the Reverse position ?

 

[Max Power]

This sounds like a shifter problem or a valve body problem, neither of which would require a rebuild. Rebuilds mostly just replace clutches and rubber seals, so I am not sure you would need one.

I would take it to a competent tranny shop.