tranny Elec ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

boilrman · 12-03-2002, 09:28 AM

I just recently helped a 74 yr old man put a new clutch in his 72 truck. He has a 4 speed in it. There are 2 electrical connections on the tranny housing. One has 2 prongs on it that look like a "T" and the other one more on top of the housing has just one prong.

Hooking these 2 back up, the 2 prong slid right back on, but the 1 prong wire wouldnt go on for nothing. The tab kept bending and finally broke off. Where can I find one of these new? The old man is bent on putting a new one in and I have called GM and they say they dont have anything going back far enough to help me. I did find the 2 prong one listed in the LMC catalog, but not the 1 prong.

Help!

Blazer1970 · 12-03-2002, 01:35 PM

The 2 prong is for the backup lights, and the 1 prong is a 4th gear indicator for the TCS system. Is the TCS vacuum stuff still hooked up under the hood? If it is not, there is no point in replacing the switch.

boilrman · 12-03-2002, 01:38 PM

what is TCS?

BUXMAN66 · 12-03-2002, 01:57 PM

transmission controlled spark.found on the 71 and up(i believe)trucks.

boilrman · 12-03-2002, 03:11 PM

ok Thanks. I found some info on it in my Haynes manual. Think I can get it figured out

12-03-2002, 09:28 AM	#1
boilrman 70 Chevy 3/4t Join Date: Sep 2000 Location: Kokomo,IN USA Posts: 1,230	tranny Elec ? I just recently helped a 74 yr old man put a new clutch in his 72 truck. He has a 4 speed in it. There are 2 electrical connections on the tranny housing. One has 2 prongs on it that look like a "T" and the other one more on top of the housing has just one prong. Hooking these 2 back up, the 2 prong slid right back on, but the 1 prong wire wouldnt go on for nothing. The tab kept bending and finally broke off. Where can I find one of these new? The old man is bent on putting a new one in and I have called GM and they say they dont have anything going back far enough to help me. I did find the 2 prong one listed in the LMC catalog, but not the 1 prong. Help! __________________ Find a job you love and you'll never have to work a day in your life. 1998 Yamaha V-Star 650 1970 Chevy 3/4t, I6 (rebuilt), 4 speed Kokomo,IN

12-03-2002, 01:35 PM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	The 2 prong is for the backup lights, and the 1 prong is a 4th gear indicator for the TCS system. Is the TCS vacuum stuff still hooked up under the hood? If it is not, there is no point in replacing the switch. __________________ Tim

12-03-2002, 01:38 PM	#3
boilrman 70 Chevy 3/4t Join Date: Sep 2000 Location: Kokomo,IN USA Posts: 1,230	what is TCS? __________________ Find a job you love and you'll never have to work a day in your life. 1998 Yamaha V-Star 650 1970 Chevy 3/4t, I6 (rebuilt), 4 speed Kokomo,IN

12-03-2002, 01:57 PM	#4
BUXMAN66 go bucks! Join Date: Jan 2002 Location: MIAMISBURG OHIO USA Posts: 803	transmission controlled spark.found on the 71 and up(i believe)trucks. __________________ '68 swb 1/2t 350/350th '86 lngbd 3/4 TON parts getter '49 gmc 1/2 t 5 window 350/350th '96 gmc sonoma sle ext-cab. hey it's a 4cyl. 5 spd and good on gas y'know?

12-03-2002, 03:11 PM	#5
boilrman 70 Chevy 3/4t Join Date: Sep 2000 Location: Kokomo,IN USA Posts: 1,230	ok Thanks. I found some info on it in my Haynes manual. Think I can get it figured out __________________ Find a job you love and you'll never have to work a day in your life. 1998 Yamaha V-Star 650 1970 Chevy 3/4t, I6 (rebuilt), 4 speed Kokomo,IN Last edited by boilrman; 12-03-2002 at 03:14 PM.



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