Tranny Swap help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bballmac42 · 12-16-2005, 09:50 AM

I am looking to swap the tranny in my truck. i have a 3 speed on the column and would like to go the four speed on the florr route. any one done this and have any insight? also, anyone know what a good 4 speed would be and where i could find one/

**Yukon Jack** · 12-16-2005, 10:50 AM

How do you use the truck? The SM465 4 speed is good and tough. Has the granny 1st gear and is pretty plentiful. Is your truck a 2wd or 4wd. That will matter when picking the tranny. You ought to be able to find these at your local junk yard.

I was told that the bellhousing hole for the three speed tranny is slightly differnet sized than the bellhousing hole for the 4 speed tranny - I have never confirmed this so you need to figure that out to see if you need a different bellhousing.

Unless you know the age and condition of your clutch, might as well throw a new one in when you do the tranny swap.

crazy longhorn · 12-16-2005, 12:03 PM

Bell housing hole sizes.....67 & older were 4 11/16"(same as car). the 68 - up got a 5 1/8" hole on the trucks. you will also need a high hump floor cover to run the 4spd truck trans. best of luck,crazyL

bballmac42 · 12-16-2005, 06:47 PM

its a 2 wheel drive truck. i was actually thinking of that tranny yukon, but am not sure where to get my hands on one.

12-16-2005, 09:50 AM	#1
bballmac42 Registered User Join Date: Aug 2005 Location: Wisconsin Posts: 60	Tranny Swap help I am looking to swap the tranny in my truck. i have a 3 speed on the column and would like to go the four speed on the florr route. any one done this and have any insight? also, anyone know what a good 4 speed would be and where i could find one/

12-16-2005, 10:50 AM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,684	Re: Tranny Swap help How do you use the truck? The SM465 4 speed is good and tough. Has the granny 1st gear and is pretty plentiful. Is your truck a 2wd or 4wd. That will matter when picking the tranny. You ought to be able to find these at your local junk yard. I was told that the bellhousing hole for the three speed tranny is slightly differnet sized than the bellhousing hole for the 4 speed tranny - I have never confirmed this so you need to figure that out to see if you need a different bellhousing. Unless you know the age and condition of your clutch, might as well throw a new one in when you do the tranny swap. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-16-2005, 12:03 PM	#3
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Tranny Swap help Bell housing hole sizes.....67 & older were 4 11/16"(same as car). the 68 - up got a 5 1/8" hole on the trucks. you will also need a high hump floor cover to run the 4spd truck trans. best of luck,crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

12-16-2005, 06:47 PM	#4
bballmac42 Registered User Join Date: Aug 2005 Location: Wisconsin Posts: 60	Re: Tranny Swap help its a 2 wheel drive truck. i was actually thinking of that tranny yukon, but am not sure where to get my hands on one.



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