Author Topic: TH350C Lock up Wiring  (Read 5290 times)

Offline sierragrande

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TH350C Lock up Wiring
« on: March 26, 2006, 05:23:00 PM »
I am looking for info on the  wiring for the lock up solenoid circuit on  my trans.This is installed in an 81 GMC 1/2t 4x4,305-4bbl.
There is  one wire coming from the vac switch on the fire wall which then goes through the transmission case and to one side of the solenoid.The other wire from the solenoid goes to a one terminal on a pressure switch on the valve body.There are two spade terminals on this pressure switch and the other has nothing on it.Is this terminal supposed to be grounded?

Edited by: sierragrande at: 3/26/06 5:27 pm

Offline DnStClr

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Re: TH350C Lock up Wiring
« Reply #1 on: March 31, 2006, 10:20:00 PM »
Yes. The sister site to this one,73-87.com had a write-up on a torque converter switch . It was by Mike Ervin, who originally owned the site.
www.73-87.com/7387garage/drivetrain/lockup.htm

Edited by: DnStClr at: 4/1/06 1:29 pm
Don
87 Chevy Silverado