Square body with 4l60E - Speed and Range Switch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

D13 · 01-19-2021, 12:59 PM

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!

01-19-2021, 12:59 PM	#1
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	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! __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors



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