This is really a great forum. I have lots of questions on my 77 Cobra II but I'll start with this one. I have two C4 trannys and access to an AOD. None are original Mustang II. One C4 is a '68, the other is around an '81 and the AOD is from an '86 truck with a roller 302. I want to use the Mustang II bellhousing, torque converter and flywheel so the few remaining hedman headers out there can be used as well. Mustang II's came with C3 and C4 trannys. I'm not sure if the input shafts from my transmissions will work with a Mustang II torque converter. From what I understand, the input shafts from Mustang II transmissions are smaller. Any help with this will be greatly appreciated.