I'm helping with a 1998 K2500 Diesel to L31 5.7 Vortec Conversion. The donor vehicle for the engine, computer, and wiring harness was a 1997 Suburban. The challenge is the 1998 K2500 has a 4L80E, and the 1997 Suburban had a 4L60E. The other challenge is trying to keep the 98 K2500 as original factory as possible (local emissions laws).
I'm thinking about upgrading the 1997 Black Box computer a 1998 ~ 2000 Black Box and use my EFI Live System to re-program the 98 ~ 00 Black Box.
What I need help with is finding a stock .tun file for a 1998 ~ 2000 Black Box computer that was used with L31 5.7 liter Vortec engine and 4L80E transmission.