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Re: 84 c10 stepside
Jeff,
Several years ago I had two way to go with mine, aftermarket controller that was expensive, now I think their are several companies making them. The other option I was using was to use the original controls GM used on certain diesel trucks/vans. These vehicles ( maybe 1 tons and bigger) wo/ computer controlled engines used three inputs, if I remember correctly. 1). Throttle position sensor, 2). Speed signal for the trans computerTC (it has a fancy name, but is a sin wave generator with input from trans - as speed increases sends more waves to TC) , and 3). Trans computer with wiring harness. Also the GM systems had two version ( early and late, the change year maybe 94 or 95). The GM control system needs to match your trans, as to early or later model. If remembering correctly the complete system were available for about $400 from junk yards.
The hard part was finding the vehicles that had this system.
If want more on the GM system, I can provide reference service manuals that give detail description. I have the manuals.
Les
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