Nice!!! i have a dana 60 in mine. it was a ranch truck and is geared so low first only gets you to 5mph, 2nd to 20, 3rd to 30, and 4th tops out at 50. i can hit 60, but it turns at 2500 when im going 40 so imagine 60!!! Finding parts on a budget for the dana 60 is, tough I have a friend with a 58 f100 with a 9" in it. he's running 2.somethings and his tach reads 2000 at 60-65 with the 4speed. wouldnt that be nice? Anyway, i'm jelous of your gear swap!! my truck doesnt even have any sound insulation!