\'88 K5 - TH400 or 700R4, that is the question. My 700r4 has lost 3rd and 4th again (rebuilt it a year ago, same problem).Another 700r4 or swap in a th400? What are the opinions out there? What would it take to do the swap? Any differences in length, bell housings, output splines? I have a stock TBI 350 and an NP208 t-case.