The Stovebolt Site Forums The Shop Area Driveline Which 4 speed do I need?

The OD trans may also be the same as the later 60-66 era trucks and others. Is it the Muncie SM318? If it is you should be able to find out how to set it up yourself; quite a few guys on the interweb running them. Also the same unit as 50's car versions, IIRC. (Why I asked if it's the SM318; not sure if trucks used them in the same era or not.) It's a planetary gear type and isn't known for being problematic, IIRC.

I think it's also pretty well agreed that you can run a pressure-oiled 235 a lot harder than 2,500RPM with no ill effects. If 50 is 2,500, then 60 should be 3,000; That's not idling or anything, but I don't think it will hurt anything to run it like that if you need to.

(I don't have any 235's to say for sure, but I haven't seen anyone that thought that was harmful-besides; trucks ran wide-open like that, anyway. I personally wind my later-generation engines up without much worry. Lot's of guys on here with 235 experience if you wanted to ask.)