Author Topic: Transmission swap stick to 700R4  (Read 4326 times)

Offline zieg85

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    • 73-87 GM squarebody extended cab and conversions up to 91 R/V series
Transmission swap stick to 700R4
« on: February 17, 2011, 08:41:13 PM »
I have all the obvious needs covered like the automatic column, linkage, shift indicator, radiator, trans lines, TV/detent cable, drive shaft.  The transmission came out of a 1987 C10 and going into a 1986 C10 that was a stick shift.  My question is what is involved with hooking up the electrical on the 700R4 to my 1986 which I am pretty sure that plug isn't under the truck.  The loom is still in the 87 but it was a TBI engine.  I desire to make it work like it is supposed too with the lockup if at all possible.  I also have a 1986 C10 if I need to get the wiring off of that but I want to understand what it is and how it works.
1985 C30 Custom Deluxe Ext. cab 5.7L TH400 3.21 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline Grim 82

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Re: Transmission swap stick to 700R4
« Reply #1 on: February 17, 2011, 09:27:44 PM »
You'll need the frame mounted bracket for the auto shift linkage, the appropriate flex plate for your motor, the low vacuum switch, and a switch that goes on the brake pedal, which I believe is to unlock the convertor when you tap the brake. TBI on the donor truck shouldn't make any difference as far as the wiring.

The 700r4 that I used to replace the sm465 in my 82 came out of an 88 sub with TBI. I pulled all the wiring and switches from my 84 parts truck with a 700, and from the 88 suburban in preparation for the swap, but I ended up with a hydraulic lockup kit in the trans when I had it built, so I didn't use any of it. If you need any of it let me know and you can have it. I ended up using the flex plate from the 84. The difference in the plates is dependant on having a 1-piece or a 2-piece rear main seal.

 There's also a link around here somewhere that shows you how to make your own lock up kit, from 73-87.com.

edit: http://forum.73-87chevytrucks.com/smforum/index.php?topic=16459.0
there's my swap thread. It worked out perfectly in the end
« Last Edit: February 17, 2011, 09:31:22 PM by Grim 82 »
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Offline Grim 82

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Give a man a gun, and he might rob a bank. Give a man a bank, and he might rob the world.