Help, want to go from 3 on column to sm465 4 speed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BCOWANWHEELS · 07-28-2011, 07:12 PM

I need to know what all needs to be changed in my 1971 chevy c10 with a 250 ,6cyl and saginaw or muncie 3 speed column shift to a sm465 granny 4 speed ? I really need a lower 1st gear in these tennessee hills when i,am hauling or towing when pulling out also a lower reverse. I have a floor shift column and the trans with shifter along with a floor shift trans cover. What else do i need ? All help is appreciated.
Bob

**Classic Heartbeat** · 07-28-2011, 07:26 PM

Alter the length of the driveline and change the end from a slip yoke to spline shaft. WES

ChevLoRay · 07-28-2011, 07:29 PM

I had a '56 SWB Chevy. The guy I got if from had installed an SM420, in lieu of the 3-speed it came with. He couldn't afford to get the driveshaft work done. I had "connections", so I swapped my '55 210 2-dr sedan for it.

I had to get a bolt-in yoke for the transmission, and then have the driveshaft modified with a slip yoke since there wouldn't be any other place for the driveshaft to have that action. Anyway, I had the driveshaft modified and I got the u-joints that would allow the driveshaft to mate up with everything, then installed it.

So, I'm thinking that you have what you need except for the modified driveshaft. You may not need any mods to it, but without looking....I'd have no way of knowing.

BCOWANWHEELS · 07-28-2011, 07:32 PM

I know my drive shaft has a slip yoke that goes up in the 3 speed so i,ll hunt up the driveline slip yoke style components i,ll need. I 'd like to have everything I need brfore i down the truck as i need it for work. thanks fellas

07-28-2011, 07:12 PM	#1
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Help, want to go from 3 on column to sm465 4 speed I need to know what all needs to be changed in my 1971 chevy c10 with a 250 ,6cyl and saginaw or muncie 3 speed column shift to a sm465 granny 4 speed ? I really need a lower 1st gear in these tennessee hills when i,am hauling or towing when pulling out also a lower reverse. I have a floor shift column and the trans with shifter along with a floor shift trans cover. What else do i need ? All help is appreciated. Bob __________________ I BELIEVE IN JOHN 3:16

07-28-2011, 07:26 PM	#2
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: Help, want to go from 3 on column to sm465 4 speed Alter the length of the driveline and change the end from a slip yoke to spline shaft. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

07-28-2011, 07:29 PM	#3
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Help, want to go from 3 on column to sm465 4 speed I had a '56 SWB Chevy. The guy I got if from had installed an SM420, in lieu of the 3-speed it came with. He couldn't afford to get the driveshaft work done. I had "connections", so I swapped my '55 210 2-dr sedan for it. I had to get a bolt-in yoke for the transmission, and then have the driveshaft modified with a slip yoke since there wouldn't be any other place for the driveshaft to have that action. Anyway, I had the driveshaft modified and I got the u-joints that would allow the driveshaft to mate up with everything, then installed it. So, I'm thinking that you have what you need except for the modified driveshaft. You may not need any mods to it, but without looking....I'd have no way of knowing. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

07-28-2011, 07:32 PM	#4
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Help, want to go from 3 on column to sm465 4 speed I know my drive shaft has a slip yoke that goes up in the 3 speed so i,ll hunt up the driveline slip yoke style components i,ll need. I 'd like to have everything I need brfore i down the truck as i need it for work. thanks fellas __________________ I BELIEVE IN JOHN 3:16

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