I have a TH-350 in my 75 K-5 (350, TH350, 203w/part time kit, dana 44 front, 12bolt rear, 6" lift 35" tires) and it won't shift out of 1st, and there are lots of metal shards in the pan. So I bought a newly rebuild TH-350 from Advanced Auto Parts and cant decide wheter to attempt swaping them myself. I know I can do it but how much time will it take? What does it involve i.e. does the t-case have to come down? If it takes more than 4 hrs and requires special tools I may just have someone else do it. What do you think?