1988 Canadian GMC C1500 305 TBI w/TH400HD going into 1973 C20 Custom Crew Cab - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dwmitchell61 · 07-29-2015, 12:43 AM

My gal has a 1973 C20 Custom Crew Cab Heavy 3/4 ton with Long Bed. It originally had a 454ci big block in it according to the VIN number. It currently has a small block 350ci & TH350 transmission. The transmission completely quit on her and the engine was getting tired.

She bought a 1988 Canadian GMC C1500 that according to the VIN has a 305ci TBI engine, the transmission is a heavy duty (HD in the bell housing) TH400 transmission with electronic speedometer.

My assignment is to put the GMC engine & transmission into the 1973 Crew Cab.

07-29-2015, 12:43 AM	#1
dwmitchell61 Registered User Join Date: Jul 2015 Location: Benton City, WA Posts: 37	1988 Canadian GMC C1500 305 TBI w/TH400HD going into 1973 C20 Custom Crew Cab My gal has a 1973 C20 Custom Crew Cab Heavy 3/4 ton with Long Bed. It originally had a 454ci big block in it according to the VIN number. It currently has a small block 350ci & TH350 transmission. The transmission completely quit on her and the engine was getting tired. She bought a 1988 Canadian GMC C1500 that according to the VIN has a 305ci TBI engine, the transmission is a heavy duty (HD in the bell housing) TH400 transmission with electronic speedometer. My assignment is to put the GMC engine & transmission into the 1973 Crew Cab.

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