The patent number helped to ID as Clark.
Military transmission Clark 5 speed 204VO.
Here is a picture with it connected to a 3 speed.
http://67-72chevytrucks.com/vboard/showthread.php?t=551114

Last edited by buoymaker; 06/25/2021 12:22 AM.

"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."