A904 to 360

BLOW-DART said
If you want to find good answers go to the early A body section here.

here i am. this is what i'm curious about.

i've got this 904 push button in my 64 barracuda which im fairly positive is original but anything is possible. its got a shift kit and a fancy pan. im getting ready to put a 360 in my car and know that i will need to make some changes to mate up the a904.

i have the b&m flex plate for the 360 that has the multiple holes already in it for the different trannys. so im fairly positive it will bolt right up to my 904 but i think i need to balance my torque converter because of the 360.

i have the tranny that used to be behind this 360 in an A100 van. its the short tail shaft (what i always thought was a 727 with a cable shift) not sure if that van tranny is actually a 727 or not. i have a balanced stall speed torque converter on that which im seeing if i can use.

i dont have the car apart so i cant just count the splines and try it but i do have the (727) and it has an input shaft with a smaller diameter set of splines and then a larger. the smaller tip has 19 splines and the larger secondary splines is 27. the bolt circle diameter on this converter from the (727) is 10" which raised some question because from some other forums i thought the 727 had an 11 1/8 bolt circle.

looking for some tips or answeres here if maybe the converter i have will work from what i think is an A100 727 or if i need to find an adapter for the 904 converter's center hub to mate up to the 360 crank.

part number on the torque converter from the 727 is tci-14110(i would love to use this cause i have it and its a stall speed and i dont have the money to just buy a new one!)

If you have the right B&M flex plate for a 360 it is already externally balanced for the 360 (It will have a large notch taken out of about 1/4 of the diameter which removes the weight on that side for balancing) if it does not have the notch it is the wrong flexplate. nothing needs to be done to the torque converter or transmission. you need to contact TCI and confirm you have a 904 10"" convertor (which is correct). do you know the stall rpm of your converter? it should match the performance curve of your cam and the rear end size you are runnuing or it will not perform optimumly. you should contact TCI and find out the applications for the torque converter and contact B&M for the application of the flexplate. just give them the part numbers and they can tell you the applications. There is no need to guess as long as you know you have a 904 transmission (numbers are found on the case). make sure the flexplate is an externally balanced 360 and that the 10" converter is for a 904 (and what stall rpm). if they are both correct it should bolt up just fine, however if the stall rpm is too high or low for your engine it won't launch very well!!! Stall speed is the rpm that the converter has full grip. you can get an idea of this speed by putting the car in drive, holding your foot on the brake, and note the rpm (you'll have to have a tachometer) where the converter grabs and stalls the engine. The stall speed determines the "snap" you get when you launch the car drag racing. It's kinda like how you pop your clutch launching a manual transmission car. if you do not intend to race it, don't worry about it the car should still drive ok.