6cyl.3spd to 8cyl.4spd swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smackmatic · 11-29-2007, 07:51 PM

I finally rounded up a v8 and for speed for my truck. Everything Ive read led me to beleive that the saginaw 4 speeds were a direct replacement for the 3 speeds. When I pulled my engine and trans last week, i was shocked to see a 3 speed trans that was apx 6in shorter than the 4 speed I bought.

I wanted to keep the driveshaft the same to save money. I didnt want to move the trans mount either. I am not sure what to do now. Worst case senerio is getting the drive shaft shortened and moving the trans mount back. Has anyone else ran into this situation? Is there an easier way to do this?

smackmatic · 11-30-2007, 12:25 PM

ttt

davidh · 11-30-2007, 01:44 PM

maybe if you move the motor mounts up forward in the V8 position there will be less space between.

smackmatic · 11-30-2007, 04:48 PM

Ill try and take some pictures of the two transmissions side by side.

**1970 CST Short Wide** · 11-30-2007, 05:13 PM

Is this 4 speed from a truck with granny low or from a car? The Car 4 speed and truck/car 3 speed are the same lenght

11-29-2007, 07:51 PM	#1
smackmatic Registered User Join Date: Nov 2005 Location: DE Posts: 76	6cyl.3spd to 8cyl.4spd swap I finally rounded up a v8 and for speed for my truck. Everything Ive read led me to beleive that the saginaw 4 speeds were a direct replacement for the 3 speeds. When I pulled my engine and trans last week, i was shocked to see a 3 speed trans that was apx 6in shorter than the 4 speed I bought. I wanted to keep the driveshaft the same to save money. I didnt want to move the trans mount either. I am not sure what to do now. Worst case senerio is getting the drive shaft shortened and moving the trans mount back. Has anyone else ran into this situation? Is there an easier way to do this?

11-30-2007, 12:25 PM	#2
smackmatic Registered User Join Date: Nov 2005 Location: DE Posts: 76	Re: 6cyl.3spd to 8cyl.4spd swap ttt

11-30-2007, 01:44 PM	#3
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	Re: 6cyl.3spd to 8cyl.4spd swap maybe if you move the motor mounts up forward in the V8 position there will be less space between. __________________ Even the nicest dodge-chrysler is only 2years away from being parked outside of Section 8 housing.

11-30-2007, 04:48 PM	#4
smackmatic Registered User Join Date: Nov 2005 Location: DE Posts: 76	Re: 6cyl.3spd to 8cyl.4spd swap Ill try and take some pictures of the two transmissions side by side.

11-30-2007, 05:13 PM	#5
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,165	Re: 6cyl.3spd to 8cyl.4spd swap Is this 4 speed from a truck with granny low or from a car? The Car 4 speed and truck/car 3 speed are the same lenght __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565



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