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56 Chevy 3200 conversion from 3 Speed to SM-420 4 speed.
#1078327 01/10/2015 3:34 AM
Joined: Jan 2000
Posts: 26
Western NY
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Blue66
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Blue66
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Posts: 26
Western NY
Hello, its been a long time since I've posted here! Good to see my user name is still valid!
Anyway, I did this swap years ago with my 1948 Chevy 3100, and am looking to do it again with a 56 3200. I want to replace the three on the tree with a factory 4 speed with creeper gear. I know it will bolt on at the engine, can't remember if I'll need a different crossmember or ujoint at the rear? Any info is appreciated! I already have the trans out if a 53 that had a torque tube.

Last edited by Blue66; 01/10/2015 3:58 AM.
1942 Chevy G7104 1.5 ton 4x4
1946 Willys CJ-2A
Re: 56 Chevy 3200 conversion from 3 Speed to SM-420 4 speed.
Blue66 #1078347 01/10/2015 5:07 AM
Joined: Nov 2005
Posts: 6,100
B. C. Canada
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Hy Blue66, you will need to change the rear output cover to an open drive type and find the appropriate output yoke for the transmission, I'm not sure if the "U" joint is larger than the 1/2 ton one or not.
Re: 56 Chevy 3200 conversion from 3 Speed to SM-420 4 speed.
Blue66 #1079110 01/14/2015 12:40 AM
Joined: Jan 2000
Posts: 26
Western NY
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Blue66
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Blue66
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Western NY
I know on Ad trucks the u joint is different. Anyone know if the u joint for a half ton 3 speed is different than the half ton 4 speed?

1942 Chevy G7104 1.5 ton 4x4
1946 Willys CJ-2A
Re: 56 Chevy 3200 conversion from 3 Speed to SM-420 4 speed.
Blue66 #1079120 01/14/2015 1:47 AM
Joined: Feb 2002
Posts: 12,029
north of the 49th
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Cruising in the Passing Lane
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north of the 49th
the U-joint is the same, but driveshaft length will be different

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
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