Never mind my last post. The Chevy master parts list doesn't break down to the internal shifter parts.
Have you tried contacting a supplier who specializes in the Mopar version of the a833 shifter?

http://www.brewersperformance.com/proddetail.php?prod=H0001


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."