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05-23-2007, 07:55 AM | #1 |
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Join Date: May 2002
Location: VA
Posts: 1,337
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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?
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05-23-2007, 07:37 PM | #2 |
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Join Date: Nov 2006
Location: Malvern, AR
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Re: Wiring for lock-up converter on 85 THM350?
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
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05-23-2007, 08:30 PM | #3 |
glamoros piece o' lowlife
Join Date: Mar 2007
Location: Redford, MI
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Re: Wiring for lock-up converter on 85 THM350?
Is it possible to run the lockup to a switch that you can engage manually?
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The more I drink, the more I drink, the more I drink... diesel, reg cab, long bed, 4 across the rear, single stack, wooden stakes, and lotsa lights - the Hay Express |
05-24-2007, 01:21 PM | #4 |
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Join Date: Jan 2004
Location: Duluth, Mn
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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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