Square body with 4l60E - Speed and Range Switch

[Zoomad75]

Originally Posted by kwmech

Speed sensor that plugs into the cable to give the signal to the ecm.

https://www.summitracing.com/parts/a...xoC4a4QAvD_BwE

Read the notes on that one.

Notes:Hall effect style sender, 16 pulse per revolution with pass-thru drive for cruise control. Adapts most GM and Chrysler transmissions with speedometer cable output. This sending unit is designed for use with Auto Meter speedometers, and will not work with OEM speedometers under any circumstances.

This is what I used on a buddy's '85 Suburban with a swapped in L29/4L80E combo. He wanted to keep the cable drive speedo but the PCM needed the VSS input for the transmission control.

https://www.summitracing.com/parts/dak-sen-01-4160

You need this converter box to change the signal to the correct pulse per mile the factory GM computer needs to function right.
https://www.summitracing.com/parts/dak-sgi-100bt