First project truck and still learning a lot, but I need advice from some of you pros. I've got the inline 6 235 in it and plan on keeping it that way. It's a manual 4-speed with the granny gear. I have to be in 3rd gear running down city streets, sometimes even 4th. Would like to feel comfortable taking it on the freeway. What's the best bolt-in tranny swap? Do I need to change the gear in the rear end? Should I do both a tranny and the rear end? Recommendations?