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Daddy'O · 10-25-2014, 01:44 PM

That is the tcs ( transmission controlled spark ) setup. You can search for more information if you want. See this thread

http://67-72chevytrucks.com/vboard/s...=spark+control

as it has some good info.

10-25-2014, 01:44 PM	#5
Daddy'O Registered User Join Date: Jan 2012 Location: Whitesboro, Texas Posts: 932	Re: What's this on the firewall? That is the tcs ( transmission controlled spark ) setup. You can search for more information if you want. See this thread http://67-72chevytrucks.com/vboard/s...=spark+control as it has some good info. __________________ Cheers - Wayne Our Shop Build - http://67-72chevytrucks.com/vboard/s...d.php?t=620966 '55 Wagon Build - http://67-72chevytrucks.com/vboard/s...d.php?t=689157 1971 Cheyenne Super Ochre/White LWB 350 Auto - my son's truck "Nancy" 1972 GMC K2500 Custom 4X4 Olive LWB 400 SB 4-speed -"Greenie" - Restoration to begin after the '55 Nothing sucks more than that moment during an argument when you realize you're wrong.