Below are photos of the first two designs of this adaptor - photos
of the current design can be found on the 700R4 advantages page.
Prototype 1 - this didn't work too well for a few reasons. First,
it was nearly impossible to hook the flexplate to the torque converter
with this method. The only way to do it was to use allen head
bolts (due to the holes falling on the "ramp" of the torque converter).
In addition, the flexplate is weakened by milling it out for the
allen head screws. I'm not sure if the strength loss is an issue,
but it concerned me. This design also used large spacers that
could act as a "bullet" if a bolt ever came loose.
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Prototype 2 - a better design, but not sufficient. This worked
much better than prototype 1, but it had two significant flaws.
First, the adaptor ring had to be machined to the torque converter
to insure absolute centering. This takes away the advantage of
a truly bolt-on kit that I was hoping for. Second, it was nearly
impossible to balance. I never did get the vibration out of the
ring altogether. I also decided that it would be better to have
the adaptor plate made out of steel (rather than aluminum) to
eliminate the flex of the plate (and to combat the plate's tendency
to crack around the starter stud).
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