the T-3650 from the sn95 is common and readily available.. will it work with my factory 66 289 and fit in the housing?

 

No. The mod motors use a different bolt pattern, iirc. And even so, the input shaft length is wrong.

 

You can get a T5, a TKO, or a T56 to fit. There are also Richmond transmissions.

 

i have a T5 and I have some problems with it and i was wondering what my options were

 

I have a tremec 3550 in my 65 hooked to a 1995 motor. The tremec needed a spacer plate between the trans and the bellhousing. I suspect but don't know that if you have that spacer plate, it will take care of the different shaft length problem pointed out by StarFury.

 

Depends on the "problems". The T5 can be an excellent transmission in the 289/302 75-73 Mustang.

 

T56? The T56 from an 03-04 cobra will bolt to my 289/302?

I guess ford only T56s work?

http://en.wikipedia.org/wiki/Borg-Wa...6_transmission

 

There are aftermarket T56's. The TREMEC transmissions are designed to fit anything American, they have varying shaft length and splines combined with bolt patterns and bell housings to get a "Ford" T-56 to fit Fords(there are T56's for Mod engines and T56's for standard SBF, and so on).

Factory T56's are sometimes application specific, and sometimes can fit an array of vehicles.

The T56 for a mod engine(4.6/5.4) is different than a T56 for a 302/351. Primarily it's the input shaft that's different.

 

The case of the T56 is much larger than a T5. You will have to modify the trans tunnel if you go this route. If memory serves, you need to raise the tunnel one inch.

 

Yeah, T56's don't fit without modification, and my TKO barely fit in my 67.