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Chevy truck rears '55-'59 vs. '60-'66
#1340334 Fri Jan 03 2020 10:30 PM
Joined: Oct 2009
Posts: 56
J
Wrench Fetcher
Are there major differences between the '55-'59 half ton rears and the '60-'66 half ton rears? Brakes? Center section?

Re: Chevy truck rears '55-'59 vs. '60-'66
John Leatherman #1340376 Sat Jan 04 2020 01:59 AM
Joined: Jan 2001
Posts: 5,005
P
Master Gabster
1955-62 use the same center section.
1955-59 had leaf springs, 1960 and later used coil springs.


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Re: Chevy truck rears '55-'59 vs. '60-'66
John Leatherman #1340380 Sat Jan 04 2020 02:23 AM
Joined: Oct 2009
Posts: 56
J
Wrench Fetcher
Thanks. Sounds like I can probably use a rear up to '62 since I just want the center section and brakes/backing plates fir my '46.

Re: Chevy truck rears '55-'59 vs. '60-'66
John Leatherman #1340387 Sat Jan 04 2020 03:04 AM
Joined: Apr 2002
Posts: 1,696
F
Fox Offline
A teacher, but always an apprentice.
I took a ‘62 3.90 gear set and bolted it right into my 1953 housing. I didn’t gain much ratio but did get open driveline. Gotta love GM LEGO pieces, hey?!


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Re: Chevy truck rears '55-'59 vs. '60-'66
John Leatherman #1340426 Sat Jan 04 2020 02:22 PM
Joined: Jan 2001
Posts: 5,005
P
Master Gabster
Like Fox mentioned, a 1955-62 center section will bolt right in a 1940-54 truck axle housing.
The bendix brake swap is not so easy, easier to change the housing.
I will add that having Huck brakes on the back is not a bad thing.


See the USA in your vintage Chevrolet!
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Re: Chevy truck rears '55-'59 vs. '60-'66
John Leatherman #1340464 Sat Jan 04 2020 08:00 PM
Joined: Aug 2005
Posts: 54
T
6 heaven
So an open driveline 55-62 1/2 ton third member will bolt into the earlier 54-49 axle housing? What about the axle shaft splines? Do they match the internal side gears from the 55+ third member?

Re: Chevy truck rears '55-'59 vs. '60-'66
John Leatherman #1340470 Sat Jan 04 2020 09:18 PM
Joined: Jan 2001
Posts: 5,005
P
Master Gabster
Same splines


See the USA in your vintage Chevrolet!
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Re: Chevy truck rears '55-'59 vs. '60-'66
John Leatherman #1340583 Sun Jan 05 2020 03:40 PM
Joined: Aug 2005
Posts: 54
T
6 heaven
Wow, that makes an open driveline a simpler possibility. What are some transmission combinations? Will a 3 speed from the 55-66 model work with the 2 shifter arms & linkages fron the original style?

Re: Chevy truck rears '55-'59 vs. '60-'66
John Leatherman #1340592 Sun Jan 05 2020 04:49 PM
Joined: Apr 2005
Posts: 1,753
R
Shop Shark
You will need later bellhousing (48 up) to use a 55 and later transmission. I'm not sure what type side cover/linkage configuration a 46 has. The 55 transmission has a 4 bolt side cover. The 1/R shift fork has to be replaced on an AD truck to use the side cover on later trans. Yours may be similar. A 3 speed overdrive transmission would be a good option.
Fred

Re: Chevy truck rears '55-'59 vs. '60-'66
John Leatherman #1340599 Sun Jan 05 2020 05:37 PM
Joined: Jan 2001
Posts: 5,005
P
Master Gabster
To be accurate you would need a 1948-53 truck bellhousing to accept the later transmission and correct bellhousing mounts.
Since a 1946 is floor shift, you would need an aftermarket floor shifter for a 1955- trans.


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