I searched for prior posts and found lots of threads on the 700R, but didn't see anything in particular to my issue. Whenever I shift into Reverse or Drive, I get a 'clunking' noise, but the tranny seems to shift half decently. There doesn't seem to be any slipping in Drive, except that the shifts are not really smooth. I just bought and towed some new bikes (3 dirtbikes, 1 quad) over the weekend, and now whenever I shift into R or D, the clunking is much louder and I can hear some additional noise like gears engaging. I recently swapped axles, currently 3.73 on 14bff (am supposed to swap to 4.56 this week), and am running on 35s. New conversion u-joint for rear d-shaft to pinion. I did not change the t-case to shaft u-joint. Could this be a u-joint problem, or the tranny taking a dump? If tranny, is it better to rebuild, buy one from junk yard, or save up and get a Bowtie?