converting SM465 to M22/21/20 T-10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

THoeler · 05-12-2014, 04:43 PM

Looking to convert my 71 SWB Stepper from an SM465 to an M-22/21/20 or T-10. New motor going in and was wondering about the hump and the driveline mostly. I could figure out the rest.

airdale94 · 05-12-2014, 05:10 PM

Not sure on the hump, but the trans. x-member and driveshaft should be stock TH350 configuration.

**68350** · 05-13-2014, 08:57 AM

If its a factory 4 speed the hump is removable. U could weld in a patch and cut your hole for your shifter after u mount tranny. Or you could find a big block auto hump which wouldn't have a hole from the factory then you could just cut the one hole you need.

Wrenchbender Ret · 05-13-2014, 04:39 PM

Check the coller on the trans you are using. The SM465 has a larger hole in the bell housing then some of the other transmissions.

05-12-2014, 04:43 PM	#1
THoeler Registered User Join Date: Apr 2013 Location: Barnegat, NJ Posts: 34	converting SM465 to M22/21/20 T-10 Looking to convert my 71 SWB Stepper from an SM465 to an M-22/21/20 or T-10. New motor going in and was wondering about the hump and the driveline mostly. I could figure out the rest.

05-12-2014, 05:10 PM	#2
airdale94 Registered User Join Date: Jan 2007 Location: Topeka,KS Posts: 778	Re: converting SM465 to M22/21/20 T-10 Not sure on the hump, but the trans. x-member and driveshaft should be stock TH350 configuration. __________________ 68' C20. 283CI w/55CC 305HO heads, NP435 Close Ratio, Corp. 14 bolt FF 3.21, 75' front end swap (everything but the X-member).

05-13-2014, 08:57 AM	#3
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	Re: converting SM465 to M22/21/20 T-10 If its a factory 4 speed the hump is removable. U could weld in a patch and cut your hole for your shifter after u mount tranny. Or you could find a big block auto hump which wouldn't have a hole from the factory then you could just cut the one hole you need. __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

05-13-2014, 04:39 PM	#4
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: converting SM465 to M22/21/20 T-10 Check the coller on the trans you are using. The SM465 has a larger hole in the bell housing then some of the other transmissions.

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