[blackdodge78]

Hello to all members on the forum.
I am in the process of replacing the torque convertor
in my truck.
I own a 1978 stepside 4x4 with a 727 tranny and a 360
engine.
Upon going to order one, I was told that there is an 11"( more common)
and a 12" torque convertor available.
I can't get an accurate measurement of what size it would be
just by looking through with the inspection cover off.
I just want to have the replacement ready instead of having to order it
after I take the tranny down.
The Chrestview Chrysler guys had a difference of opinion but most said
i would need a larger 12" torque convertor for a 360/727 setup.
Anyone here happen to know from experience?
Much appreciated.

 

[sgillett]

Hi blackdodge78,
Unless you are running a hotroded motor, a smaller torque converter will not help. They make way more heat and feel funny when you hit the gas, kinda loose like the truck doesn't want to move with small throttle openings. The small converter does make the truck launch better when you stand on the throttle and allows the motor to rev higher to take advantage of a bigger cam. The 10 3/4" (11") converter uses a smaller bolt pattern on the flex plate too. The starter ring gear on the 11 3/4" (12") is pretty narrow and the 10 3/4" is around 3/4" to 1" thick (side of converter to the starter teeth) That may give you a way to tell which one you have.
My $.02
Scott

 

[blackdodge78]

Thanks a lot. I'll have to check that out.

 

[Speed Dragon]

Yeah get the big one, it'll give better milige. As far as the flexplate, usually you can buy the same converter for either one nowadays, but if not it's a simple thing to change w/ the trans out, and you can usually pick one up used for 20-30 bucks. I have several of each laying around that I've collected

 

[bigdog440]

my 78 has the 10 3/4. just make sure you get the correct weighted converter. 360 is externally balanced. learned that the hard way when i was young. lol