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Old 07-26-2005, 08:01 PM
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700R4 with Vortec Computer Controlled Engine

I have installed a 1997 Vortec into a 1986 Suburban with a 700R4 transmission. After giving up on determining what wires I need to hook up on the factory engine harness, I began to look at Painless Wiring, Howell EFI and other replacement stand alone harnesses. The feedback I have received is misleading. Since many of these trucks came with manual transmissions, I assumed that the 700R4 would work if I used a lock up kit for the converter. Painless tells me that there harness it will only work with an electronic transmission. I heard from several supposed techs to drop the 700R4 and get something else. Will this work? Do I need to get a variable speed sensor, or will the engine run without it? Will I need to reprogram the engine computer if I use the 700R4 which is not an electronic transmission? Do I need to give up and use a 4L60E or 4L80E?
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