TH700R4 Wiring Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jrmdigger72 · 09-23-2010, 12:22 PM

I'm in the process of changing my TH350 to a TH700R4 transmission in my 72. I got the transmission out of a 92 2wd Suburban. I purchased a TCI Torque Converter Lockup Wiring Kit, p/n 37660, and have it installed in my transmission. I was told that this kit would not work in my truck and I should purchase a kit from GM Performance Parts, p/n 24502513, which eliminates the the wiring harness and only changes the TV spring in the valve body. Anybody have any expierence with either of these kits? I'm ready to put the transmission in this weekend but I'm going to hold off if the kit I bought isn't going to work.

red71cheyenne · 09-23-2010, 12:58 PM

It will work just fine in your truck. Just wire it up to the spare terminals on your brake switch on the pedal. Thing is you want the TC to unlock when you step on the brake, so make sure you are using the right terminals. Open when brake on and closed when brake off.

You can use the other one for a hydraulic lock up as well, but this one is fine.

raycow · 09-23-2010, 08:14 PM

Does the wiring kit include a replacement brake light switch? The stock switch on these trucks has only 2 terminals.

Ray

cparman · 09-23-2010, 08:54 PM

I have a 700 in my Blazer. I bought a stop light switch for a 78 Corvette with cruise control. Wired the brake lights as usual. The cruise side of the switch was wired to the A terminal on the trans ( purple wire ). I interrupted this wire with a toggle switch. This way I could ' lock up' the converter when I wanted. This way when you are cruising 40 ish, you can let the converter be ' unlocked' . This will keep your truck from lugging, like it is in too high of a gear. Lokar cable, and their bracket at the holley carb

09-23-2010, 12:22 PM	#1
jrmdigger72 Registered User Join Date: Mar 2008 Location: Young America, MN Posts: 44	TH700R4 Wiring Question I'm in the process of changing my TH350 to a TH700R4 transmission in my 72. I got the transmission out of a 92 2wd Suburban. I purchased a TCI Torque Converter Lockup Wiring Kit, p/n 37660, and have it installed in my transmission. I was told that this kit would not work in my truck and I should purchase a kit from GM Performance Parts, p/n 24502513, which eliminates the the wiring harness and only changes the TV spring in the valve body. Anybody have any expierence with either of these kits? I'm ready to put the transmission in this weekend but I'm going to hold off if the kit I bought isn't going to work.

09-23-2010, 12:58 PM	#2
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: TH700R4 Wiring Question It will work just fine in your truck. Just wire it up to the spare terminals on your brake switch on the pedal. Thing is you want the TC to unlock when you step on the brake, so make sure you are using the right terminals. Open when brake on and closed when brake off. You can use the other one for a hydraulic lock up as well, but this one is fine. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

09-23-2010, 08:14 PM	#3
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: TH700R4 Wiring Question Does the wiring kit include a replacement brake light switch? The stock switch on these trucks has only 2 terminals. Ray

09-23-2010, 08:54 PM	#4
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	Re: TH700R4 Wiring Question I have a 700 in my Blazer. I bought a stop light switch for a 78 Corvette with cruise control. Wired the brake lights as usual. The cruise side of the switch was wired to the A terminal on the trans ( purple wire ). I interrupted this wire with a toggle switch. This way I could ' lock up' the converter when I wanted. This way when you are cruising 40 ish, you can let the converter be ' unlocked' . This will keep your truck from lugging, like it is in too high of a gear. Lokar cable, and their bracket at the holley carb



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