Engine is not in a m37 but its a replacement engine in a 1948 Dodge truck I recently picked and it does not appear to be the original engine and trying to figure it what it is out of any suggestions would be appreciated. I can not read the engine # I hit it with a wire wheel even tried some chalk bu...

Thanks for the information
Ed

I am thinking about getting a m37 from some of what I read it looks like the early ones had the 5.xx rear and newer I think after 53 or 54 had a 4.88 rear is this correct. I had a 4.88 in a few trucks and that is about as low as I would like to go. I know I can swap gears but I would rather not do i...