I am trying to figure out a trany and rear combo for my 3/4 ton project and wanted to know what the ideal rpms at first second third and o/d are for a 283. it is a rebuilt 283 out of a early 70s passenger car, want something that could haul light loads occasionally and keep up on the highway and I don't want to burn up my engine running it too hard at 70 mph. definitely learning/ making it up as I go on this project this site has been a huge help.