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-   -   Wiring for lock-up converter on 85 THM350? (https://67-72chevytrucks.com/vboard/showthread.php?t=242204)

Tink 05-23-2007 07:55 AM

Wiring for lock-up converter on 85 THM350?
 
We recently replaced the 305 in our 85 Silverado with a rebuilt one from a 70s car. When we removed the old 305, we ditched a lot of the computer and emissions BS. However, it seems that we must have gotten rid of whatever fed/controlled the lock-up torque converter on the TH350 - it doesn't seem to be working now. Can someone here tell me what the wires are that feed it and what not?

78Chevy 05-23-2007 07:37 PM

Re: Wiring for lock-up converter on 85 THM350?
 
2 Attachment(s)
Okay, I don't know if this will help or not, but I have attached a couple of wiring diagrams for an 85 305. I know that you have replaced the 85 with one out of a 70's car. I'm not a 100% sure, but I think that the ECM that controls the engine also controls the trans. Also, over in FAQ on the secound page of Truck Tech there is a post that says Turbo 350c Lock Up Wiring by dhill it has a wiring diagram for the trans, but I don't know whether or not it will help you if it went through the ECM.

Good luck

Al

Ivan D. 05-23-2007 08:30 PM

Re: Wiring for lock-up converter on 85 THM350?
 
Is it possible to run the lockup to a switch that you can engage manually?

BADGMC 05-24-2007 01:21 PM

Re: Wiring for lock-up converter on 85 THM350?
 
Yes you can hook it to a manual switch. I don't remember which pins to hook up to on the trans though. There are a few sites around that explain it really good. I will try to remember what they are.


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