3 speed to 4 speed conversion

[drk]

Because I posted this first in the for sale section...

Forgive me if this question has been asked. I just need some clarification.
I've got a 66 Mustang. C code 289 with a 3 speed. What all do I need to convert to a 4 speed? Also, which transmissions will fit? Anything with a RUG code, and close ratios, correct? I have come across one with the code: RUG-C (close ratio) with 28 spline and 1 3/16 output shaft. This was out of a 68 Fairlane. Will it bolt up to my 66?

 

[dennis112]

A "Mustang" small block transmission (wide or close ratio) will fit in place of the 3 speed. Same length. You would also need a shifter and (I believe) the tranny yoke from a toploader or a C4. Easy swap with the right parts.

The Rug-C is NOT a good candidate as it was originally spec'd for a 390 and would have the wrong input shaft length and the shifter mounting is in the wrong location. Look for a tranny from a Mustang (65-73) or Cougar (67-73) with a 289, 302 or 351 and you would be good to go.

Check out this site to learn more about toploaders and how to ID their parts: http://www.4speedtoploaders.com/

 

[D.Hearne]

He needs a Mustang, Fairlane, Cougar or Comet small block Toploader. For it to be a bolt in swap. Wide ratio is prefered. And I ditto Dennis's findings on the 390 transmission, unless you can get hold of the thicker Boss 302 pilot bushing, also used on some early Bronco's too.