Square body with 4l60E - Speed and Range Switch
 

It's been a while but I'm still here with more annoying questions!

Project - 198x K2500, Straight 6 250, NP241 from 89 K5.
Trans - 1993/94 4L60E.

Essentially pulling entire wiring harness out of a 1994 K10 4.3 V6 to convert my old straight six to TBI, and get an ECM that will run the 4L60E. Question I have is with the shifting. ECM needs speed signal and range switch to manage the gears correctly. The 94 has those, but I think the 89 NP241 does not have the exact same set up for range switch, and it's a cable speedo. And I can't swap the cases directly (wrong side drop). Anyone got a great idea? I like my cable drive speedo but it's not a deal breaker if I can figure out everything else.

Thanks!

Re: Square body with 4l60E - Speed and Range Switch
 

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

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

Re: Square body with 4l60E - Speed and Range Switch
 

Read the notes on that one.
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