I cannot get a straight answer on this. The transmission in my '95 Chevy ECSB truck shifts great and only has 140k on it. I want to keep it in my truck. I'm picking up a '99 5.3, wiring harness and ECU in two weeks. My question is, will the 5.3 ECU be able to control the '95 4L60E I have in my truck? Some people were saying that I'd need to get a '96-00 4L60E to make it work, since the '95 is a one-off year for tranny's. But Brendan from lt1swap.com said it will control it since the '95 is the first year for 13 pin transmission connectors. So, has anyone kept their pre-96 OBS transmission and just swapped the engine? I plan on following the harness modifications on lt1swap rather than buying one for $500+.