69/70 FMX -> C4 Swap

[351carlo]

So it's come to a point where I'm making too much power for my small stall converterter. Instead of just getting a custom converter for my FMX I'm going to go with a fully rollerized, reverse manual valvebody C4 Trans with a brake and 4000 stall converter.

i'd like suggestions, as well as what is entailed aside from: Converter, Bellhousing Trans. What linkages do I need? Any chance of using a stock appearing shifter? (My interior is almost 100 percent stock appearing). What about crossmember, driveshaft length? Any ideas on flywheel?

THANKS guys!

 

[jes72mustang]

I think you should be able to use the stock shifter. Weren't the c-4s available for those years or were all automatic mustangs FMXs in 69/70?

 

[jbuening]

You can reuse the shifter itself, but you'll have to remove the neutral safety switch from it cause the C4 trans has the switch on the trans and not the shifter. From what i have been told, the shifter linkages are different and you'll have to find the C4 ones. You'll need the C4 trans crossmember too. Driveshaft lengths were within an inch (off the top of my head) so your driveshaft should still work. Flywheel is the same also.

 

[351carlo]

So my 70 flywheel is a 10 1/2 inch 164 tooth deal?

And any decent crossmembers made? It's gonna have a lot of torque, I don't want to break a stock stamped steel.

Are the yokes the same?

Thanks guys