700R4 was just the old designation before they started calling 'em the 4L60.
Now, 'bout yer wiring.
Flip that '91 tranny upsidedown and pull the pan. We gotta rewire it to marry to the '86 control switches.
I'm going by memory here, so bear with me. :>)
All we're dealing with is a hot wire and a ground wire at the tranny case connector. The "juice" comes in, routes thru the solenoid, thru the control switches and then back out to be grounded by the computer on a '91 model.
That ain't a gonna work on an '86.
Replace the 3-4 pressure switch with a normally open, 45 to 60 lb self grounding switch(if ya can't find a self grounding switch, ground one terminal to a valvebody bolt).
THEN, the white wire coming in (may be yellow on your tranny) goes to the TCC solenoid, other wire from the solenoid goes to the switch and then when the switch closes, it grounds thru itself at the valve body. When the circuit is closed, the TCC solenoid locks 'er up.
Just ignore the other switches at the valve body and the other wire at the case connector. The 86's vacumn switches will handle the breaking of the TCC circuit for acceleration and the 'brake' switch is already incorporated in that circuit anyway.
The way they wired those diesels from the factory was a nightmare......just don't need all that herky-jerky contraption; just a high pressure lock-in switch.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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