I tried mounting a GM auto trans to the 6G72 but found the starter interfered with my steering linkage so I moved over to a C4 Ford and built a reverse starter system
I needed to build a flex plate so I got some HSLA commercial grade 1/8 in plate and marked the center with a small starter hole, you can see the original flex plate was built from 1/16th but its shape was fairly close
this machine is called a nibbler or pullmax style machine, it was built for making circles, but I also build my own dies for what ever purpose I want to use
a flex plate is just that, it flex's and its also like a spring, it gets pushed forward under load, the flex plate has to move about .060 so a bit of a bend not only keeps a little of pressure against the load but when you bend steel, you double its strength without adding weight
I opened the center hole so I could mount my adapter and then drilled it to accept the Ford C-4 torque converter and this was one of the reasons the C 4 was chosen, it has a 10.5 in bolt circle pattern, which was just small enough to fit inside the ring gear that was selected, the GM converter was 10.75 and would not fit
I mounted the flex plate to the coupler just for the center, then I trimmed the outer diameter to size for the ring gear
this is the finish look, I need to pay some attention to detail but I was pretty happy with it, with the smaller ( 10 in or smaller ) converter I will be mounting the starter as a reverse set up but I kept the ring gear on the flex plate so anyone could select and buy what ever stall speed converter they may want
Edited by Bill Hincher, 19 August 2011 - 11:52 AM.