I have a 700R4 in my 90 K5 with 6 inch lift, 35's, and 3.73 gears. We lost 3rd and 4th gear last weekend while wheeling. Should I keep the 700R4 and rebuild it or is there a better more suitable trans? Edit - OK - after reading earlier posts about what trans is best and what mods to the driveline should be made I think I have become confused!! I'm guessing I should rebuild my 90 700R4 with a shift kit and call it good or should I replace it with a 4L80E? What is your opinion?