[mark '87 930]

Thanks for the, the truck is actually originally from Oklahoma, so I'm pretty sure that it would be a US rear diff, however, if it is not, then I will ensure i have a grinder handy.

Going back to the OD ideas, I read that a mopar 1-883 transmission is a good bolt in, is that true? I do like the sm420 as it sounds like it's rugged and will not be easy to break. I don't race and use the truck driving ont he hwy 95% of the time. I do pull my boat to and from teh marina twice a year with it, but that's only 2 miles away..