The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - TH400 Side plug Question. What is it for?

Longhorn Man · 01-04-2009, 12:26 AM

the safety switch is on the column.
If that plug has a single spade on it, then it is the electric kickdown. If it is a double, then it is the kickdown, and the transmission controlled spark (TCS) which was an early smog control device that kept the timing from being advanced untill the engine was up to temp, and in final drive ratio.

01-04-2009, 12:26 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: TH400 Side plug Question. What is it for? the safety switch is on the column. If that plug has a single spade on it, then it is the electric kickdown. If it is a double, then it is the kickdown, and the transmission controlled spark (TCS) which was an early smog control device that kept the timing from being advanced untill the engine was up to temp, and in final drive ratio.