My TH350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jbristo67 · 03-22-2009, 02:14 AM

My turbo 350 that I picked up today has a plug on it like a 700r4. What is it and how do I make it work on my 67

JimKshortstep4x4 · 03-22-2009, 05:24 AM

Depending on the year of the transmission the "plug" could be part of the TCS systems that were put onto vehicles. If it is then the transmission "plug" was for signaling the TCS system when the transmission was in high gear.

I am not sure what other function a "plug" would have on a TH 350.

Jim

Longhorn Man · 03-22-2009, 10:18 AM

the TCS plugged in by the cooler lines.

Does the TH350C have the plug he is describing?

**clay68c10** · 03-22-2009, 10:19 AM

I think the lockup 350C has that plug. It engages the torque converter clutch.

jbristo67 · 03-22-2009, 01:14 PM

SO what do I need to make it work????

**Boog** · 03-22-2009, 01:46 PM

I have one too. From what I can find we will need the plug in, vacumn/electric solenoid on the firewall and a cancel switch on the brake pedal and a fused power lead of course. I checked with a local trans man and he said I could not use this trans with a regular converter without making some change inside and could not run it without the converter switch hooked up or it would burn it up. I'm lookin to rebuild my plain t350 instead.
Bill, Palf 70 step, has one of the 350C trannys in his though I don't know if he has driven it or has the converter hooked up.

jbristo67 · 03-22-2009, 05:34 PM

Quote:

Originally Posted by Longhorn Man

the TCS plugged in by the cooler lines.

Does the TH350C have the plug he is describing?

Its on the opposite side of the coolant lines. It is out of an 81 GMC pickup

jbristo67 · 03-23-2009, 01:33 AM

What if I just Dont hook it up

jbristo67 · 03-23-2009, 01:18 PM

???

Longhorn Man · 03-23-2009, 03:27 PM

then your converter will slip a bit more than you want and build up some added heat.
Won't kill your tranny real fast, but not good for a long life either.

jbristo67 · 03-23-2009, 03:37 PM

Just talked to the tranny shop they said no big deal will just run 200 or so rpms higher in 3rd. I can live with that

**Palf70Step** · 03-23-2009, 03:39 PM

Yes, that is what I am told. A bit more slip. I don't have mine hooked up yet, but I have the harness to hook mine up whenever I get to the rerwiring stage on mine.

jbristo67 · 03-23-2009, 04:11 PM

My friend bought a truck with this tranny in it. It had been rebuilt and never run because the guy put a new cam in the motor and messed it up. Well my friend pulled the motor and tranny and gave me the brand new tranny. I was going to run a 700 but times are tight right now so I will run this one until it blows up

03-22-2009, 02:14 AM	#1
jbristo67 resident oilfield trash Join Date: Jan 2009 Location: Lubbock TX Posts: 1,465	My TH350 My turbo 350 that I picked up today has a plug on it like a 700r4. What is it and how do I make it work on my 67 __________________ 1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada

03-22-2009, 05:24 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: My TH350 Depending on the year of the transmission the "plug" could be part of the TCS systems that were put onto vehicles. If it is then the transmission "plug" was for signaling the TCS system when the transmission was in high gear. I am not sure what other function a "plug" would have on a TH 350. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

03-22-2009, 10:18 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: My TH350 the TCS plugged in by the cooler lines. Does the TH350C have the plug he is describing?

03-22-2009, 10:19 AM	#4
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,935	Re: My TH350 I think the lockup 350C has that plug. It engages the torque converter clutch. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ Last edited by clay68c10; 03-22-2009 at 10:20 AM.

03-22-2009, 01:14 PM	#5
jbristo67 resident oilfield trash Join Date: Jan 2009 Location: Lubbock TX Posts: 1,465	Re: My TH350 SO what do I need to make it work???? __________________ 1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada

03-22-2009, 01:46 PM	#6
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,141	Re: My TH350 I have one too. From what I can find we will need the plug in, vacumn/electric solenoid on the firewall and a cancel switch on the brake pedal and a fused power lead of course. I checked with a local trans man and he said I could not use this trans with a regular converter without making some change inside and could not run it without the converter switch hooked up or it would burn it up. I'm lookin to rebuild my plain t350 instead. Bill, Palf 70 step, has one of the 350C trannys in his though I don't know if he has driven it or has the converter hooked up. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

03-23-2009, 01:33 AM	#8
jbristo67 resident oilfield trash Join Date: Jan 2009 Location: Lubbock TX Posts: 1,465	Re: My TH350 What if I just Dont hook it up __________________ 1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada

03-23-2009, 01:18 PM	#9
jbristo67 resident oilfield trash Join Date: Jan 2009 Location: Lubbock TX Posts: 1,465	Re: My TH350 ??? __________________ 1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada

03-23-2009, 03:27 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: My TH350 then your converter will slip a bit more than you want and build up some added heat. Won't kill your tranny real fast, but not good for a long life either. Last edited by Longhorn Man; 03-23-2009 at 03:27 PM.

03-23-2009, 03:37 PM	#11
jbristo67 resident oilfield trash Join Date: Jan 2009 Location: Lubbock TX Posts: 1,465	Re: My TH350 Just talked to the tranny shop they said no big deal will just run 200 or so rpms higher in 3rd. I can live with that __________________ 1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada

03-23-2009, 03:39 PM	#12
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,820	Re: My TH350 Yes, that is what I am told. A bit more slip. I don't have mine hooked up yet, but I have the harness to hook mine up whenever I get to the rerwiring stage on mine. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

03-23-2009, 04:11 PM	#13
jbristo67 resident oilfield trash Join Date: Jan 2009 Location: Lubbock TX Posts: 1,465	Re: My TH350 My friend bought a truck with this tranny in it. It had been rebuilt and never run because the guy put a new cam in the motor and messed it up. Well my friend pulled the motor and tranny and gave me the brand new tranny. I was going to run a 700 but times are tight right now so I will run this one until it blows up __________________ 1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada

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