Ok, lotta questions gonna be in this. Anyway, my tranny is leakin like a sieve, and its starting to be a pain to get into reverse. Also likes to slip alot in Reverse, like if i got my back tires in the gutter forget backin out of it. Just for reference I have a 496MPFI, call it 450hp, and 640tq, peaking tq at 2000-2500rpm and hp at 4k-4500. Least according to Desktop Dyno. This is the HD case th400 I have. I have a 36 case th400, but I have heard the HD case is thicker. (the HD or the 36 is stamped into the bellhousing area). 1. What internal parts should I swap 2. What stall converter should I go to (stock seems to be good, but I dont know what I would gain, its a DD, mud/trails, hauling truck) 3. Im going to have a stage 2 shift kit, unless that will put unnecesary wear, then I will go stage 1. 4. Any brand of parts better than others, B&M, TCI, etc. 5. Wont be doing this myself, will pull and install myself, what would be approx cost with all the goodies mentioned above, shop labor, parts, seals, etc.. 6. Should I pull it with the t-case attached or take t-case off first. 7. Should I run synthetic tranny fluid after I rebuild it? 8. Is there a break-in period on a tranny like on an engine w/ no synthetic? 9. Which type of tranny cooler is better, a stacked plate, or a tube and fin. I already have a tube & fin for my oil cooler, a 6 pass permacool, should I get same type for tranny or is one of the B&M stacked plate style better. Thanks guys, I know this is long, but answers are much appreciated. Chris.