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01-04-2019, 11:14 AM | #1 |
Senior Member
Join Date: Jul 2009
Location: Athens, AL
Posts: 499
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Re: '08 4L60e wiring - nss, reverse & gear?
I've done what you're asking on a 4.8/4l60E swap into a Jeep YJ. Unfortunately, I didn't keep a schematic of what I built. Basically, the trans mounted PRNDL switch grounds one or more of four outputs that are referenced as A, B, C, and P in the GM wiring diagrams. Use a voltage meter to make a chart of which wire(s) are grounded in each gear. You'll find that 3 of 4 lines are all you'll need to represent the 7 gear positions (P,R,N,D,3,2,1). Then you just need to use a network of diodes (or a single IC) to build a circuit to control LEDs (or one of the Lokar LED gear indicators). Google 3 to 8 decoder to see some examples of the circuit you'll need.
This thread shows something similar (posts #35 and #39): https://www.67-72chevytrucks.com/vbo...=725451&page=2 It's not a particularly easy thing to do if you're not handy with a soldering iron and building your own circuits. I think Dakota Digital (and probably others) sell decoders for this sort of thing but they're definitely not as cheap as using the stock switch. |
01-04-2019, 11:20 AM | #2 | |
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Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 956
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Re: '08 4L60e wiring - nss, reverse & gear?
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