There might have been a company that offered a commercial TBI computer adapter. There might have been some interest for a commercial TBI computer adapter catering to a transmission upgrade like 700R4 to a 4L80E. The 1st generation TBI computer 1227747 is very popular, the 2nd generation TBI computer 16197427 is a PCM the factory used to control both the 4L60E and 4L80E. Seemingly a Plug-n-Play transmission upgrade would be a viable product? The increased popularity of the "Fix All" LS engine swap would make a TBI computer adapter a "not commercially viable / profitable product".

dave w