NeptuneGreen55. Excellent work.

Don't know if this helps. From factory assembly manual. I can send a larger-clearer image.
L.D. means left had drive.
Attachments
55 Transmission 02.jpg (120.77 KB, 124 downloads)

"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."