going on about 4 years since I did mine.....I planned the swap sooner but trans and all the other stuff wasn t ready or in.. when I dropped my stroker in .. figured I would just fine tune the new engine ,put a few break-in miles on it..and take it easy on the TH350 in it till I had all the necessary parts to make the swap to TH700r4...4 days and a couple full power shifts later ,the TH350 was toast behind the Stroker..but, the rest of my parts were in by then....its a great combo... with my 3.73 gears I run only 2550 RPM at 80 MPH in 4th ! I get near 20 MPG hiway ..