hay everyone,
I have a pontiac firebird 94 with lt1 after a several trans rebuilds i decided to swap the 4L60e to 4L80e the trans that i got have 2 speed sensors and i didn’t know how to connect them, on the ECU i got red, black, gray and blue connectors
Someone can help me with that?

 

you'll have to look at a wiring diagram for your ECU and figure which pair is the VSS (rear) and which is the Turbine speed (front)

i dont think lt1 ecu's looked at turbine speed but i havent played with them much

 

I would start here and see if this helps. Most of us are doing this on 411PCM and newer.

https://lt1swap.com/1996_vortec_5.7/index.htm