Carb to TBI conversion

[c5wagner]

A VSS is a must in my opinion because the decelerator fuel cut off (DFCO) and a few other speed controlled things like EGR and stuff. The confusion above is that a 4l60e or 4l80e electronically controlled automatic needs a vehicle speed signal buffer to handle the VSS signal to the ECM to control the trans. Non PCM controlled trans like: TH350, TH400, 700r4, sm465, sm420 and etc would only need a VSS for the engine control like DFCO and etc. In tunerpro, you would specify speed signal not from DRAC and need a 2000 pulse per miles VSS like the 2prs from jags that run and set it for manual transmission options.