700r4 vacuum switch?

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Tombo

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Mar 16, 2019
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Location
Auburn, Al
First Name
Thomas
Truck Year
1984
Truck Model
K5 Blazer
Engine Size
350 Vortec
Just got my 84 k5 going. Has a built 700r4. I don't have tc lockup. All of the factory emissions stuff was deleted prior to me owning it. I've read up on the converter vacuum switch mounted by the brake booster for lockup but have no idea how to go about hooking that up. Vacuum diagram shows it having a delay valve. What do I need to hook that up correctly and which port on the ol qjet should I connect it to for proper operation?
 

john ward

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Aug 8, 2018
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Location
UK
First Name
john
Truck Year
77-83 and inbetween
Truck Model
c10
Engine Size
305
Just had same problem all parts missing from plug on g box to engine, so used a TCI lockup kit all good now.
 

Swearbody

Full Access Member
Joined
Nov 4, 2018
Posts
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Location
Birmingham AL
First Name
Jeff
Truck Year
84
Truck Model
C1500
Engine Size
355 sbc
Im doing the same thing today...what a coincidence. Mine is locking up immediately in 2nd. Im hoping its something simple like that vacuum switch being plumbed wrong.
 

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