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  1. Hey I'm looking for some insight. I have an 84 d150 with a 318. 3SPD auto. I was wondering what I can put in the diff and swap for a tranny as simple as possible to get it above 65mph. This is my first real project/build and I have no idea where to even start. I already plan to swap the intake and 2bbl carb for a 4bbl carb and throw a basic turbo on for a little extra power. But that'll be useless if I blow the tranny tryin to go over 65mph. Thank you for any help. Sent from my SM-G965U using Tapatalk