Thought you may have a "FYI" interest in the attached. I did this mod on my 3 spd OD trans. My differential gear ratio is 3:38 (1957 Chev NAPCO truck). I have no problem with pickup, but it does have a modified 348. When I had the 283, it was still decent.
don
Attachments
od_six_speed_diagram.pdf (335.44 KB, 12 downloads)