[Mtume]

I´m installing a th700r4 in my car and when I looked at the old th350 there was a big "C"(about 2 inches) on top of it. What´s up with that? What does that tell me?

 

[72ratchet]

I'm not real sure but in the early 80's they made a th350c tranny which had a locking torque converter for a little bit of improvement in gas mileage.

 

[dreis454]

maybe for Chevy bolt pattern.........

 

[BlueSS454]

Is there an electrical connection on the case anywhere? If so, it's a TH350C that would have had a lock up torque converter from the factory.

 

[Mtume]

Is there an electrical connection on the case anywhere? If so, it's a TH350C that would have had a lock up torque converter from the factory.

I dont know, I´ll check it out.

 

[novaderrik]

i've seen that before. but i can't remember what trans it was on.
does it have a tv cable, or a kickdown cable? i've got one oddball long tailshaft TH350 that doesn't have a lockup plug on it and has a tv cable instead of a kickdown.
itwas in an an 85 GMC 2wd truck.

 

[Mtume]

here´s a pic of it. Maybe it´s of some help?

 

[Schurkey]

First Guess: GM has several molds for casting the trans cases. Your case came from mold C.

 

[hrd]

now i want to see a BOP turbo 350, i wonder if they're marked like that too, just for kicks, i'm going with c = chevy too.