4yyff

[1WildII]

curious if anyone could help me decode the tranny code 4yyff, and give me a little info on that tranny, its on the back of a 250 inline six in what looks like a 79(one of the early foxes, not sure on the year) Im thinking off purchasing this trans to put on a 302, i know the 250's on the back are the same as 302s, but is this tranny gonna hold up to a mild 1974 302 4bbl?

thanks
chris

 

[Mustang5L5]

Where are you getting that code from?

 

[1WildII]

its off the door tag...

 

[Mustang5L5]

Ah ok, as i suspected.


You actually mixed the trans code with the spring codes as well as they are both listed under the TR

4 is the trans code.

YY is the front spring code
FF is the rear spring code


Anyway, 4 refers to the 4-spd manual...which i beleive is the SROD. Is it gonna hold up? I don't beleive so...but the bellhousing is the correct one to mount a Tremec 3550 to