attached to my 351W is a ford automatic tranny which i believe is a c4. it got me thinkin. i was just wondering what the differences are between the 2, both visually and performance wise. thanks

 

c6 is stronger... but heavier and sucks more power - overkill but for all the baddest of the bad engines...c4's can be quite strong

 

o i thought this topic wuz on corvettes

 

it's easy to tell the difference between the two, the bell housing on the C-6 tranny is integral with the tranny and cannot be removed separately where the bellhousing on the C-4 can be removed from the tranny with 4 or 5 bolts taken loose. joe is right about the C-6 being the big bad tranny that came behind the big blocks and the 351 Cleveland engine I think. most racers prefer a well built C-4 since it's much lighter and has less frictional power losses internally compared to the C-6.

 

& that is good, because mine is cracked. My neighbor went through 19 trannys in his '89 GT including 1 C6.

 

19 trannys? you got to be kidding! what the heck was he doing to go through that many???

 

well, these are exactly the answers i was looking for, so thanks for that. now i am sure mine is a c4. i might do a little to it (manual valve body, higher stall) just so i can have some fun with it next summer.

 

remember, if you are running a stall you should have a good tranny cooler, especially if its street driven.

 

any suggestions for cheap but affective upgrades to a c4 tranny?

 

c-6 here in socal is really hard to get good parts for, c-4 is a good tranny and is not that much weaker than a c-6. if i was you i would go after market TCI or something close to that.