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1949 Chevy dually axle
#1398590 Wed Feb 24 2021 03:55 AM
Joined: Feb 2021
Posts: 46
B
Wrench Fetcher
Hello all, I've searched to find no answer on the internet for the specs
On my 1949 Chevy Dually axle. Anyone interested in chiming in? I may run it for
a year or two with the old drum brakes. Just want to know what I have.
I appreciate any help offered. Attached are a few pics.

Attached Files
20210223_152901.jpg (200.92 KB, 194 downloads)
20210223_151736.jpg (261.69 KB, 195 downloads)
20210223_151743.jpg (203.18 KB, 189 downloads)

Out with the new, in with the old.
Re: 1949 Chevy dually axle
BignScar #1398607 Wed Feb 24 2021 12:37 PM
Joined: Sep 2001
Posts: 31,055
'Bolter
Welcome to Stovebolt.com, BignScar

Have you checked out the menu/links at the top of this page?

There might be some information here? [chevy.oldcarmanualproject.com]

If you have specific questions, post them in the appropriate forum. In each new thread/question, give the make, year, model truck you are referring-to/working on.

Good luck.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 1949 Chevy dually axle
BignScar #1398620 Wed Feb 24 2021 02:39 PM
Joined: Nov 2005
Posts: 5,876
3
3B Offline
'Bolter
Hy BignScar, welcome, your rear axle is a vacuum shifted Timken double reduction two speed, that was the factory two speed differential in that era, hope that helps.

Re: 1949 Chevy dually axle
BignScar #1398626 Wed Feb 24 2021 04:16 PM
Joined: Jun 2011
Posts: 3,997
E
'Bolter
The gear ratios are low and lower, compared to today’s ratios. Ratios may be stamped on the top of the case.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: 1949 Chevy dually axle
BignScar #1398634 Wed Feb 24 2021 05:09 PM
Joined: Nov 2005
Posts: 5,876
3
3B Offline
'Bolter
Hy BignScar, further research has identified two possible ratio options, one is 6.13 to 1 in high gear, 8.10 to 1 in low gear, or 6.70 to 1 in high gear, 8.86 to 1 in low gear, hope that helps.

Re: 1949 Chevy dually axle
BignScar #1398676 Wed Feb 24 2021 09:32 PM
Joined: Feb 2021
Posts: 46
B
Wrench Fetcher
Thank you guys, wow!! Must of been used to tow tanks and locomotives 🚂!!!!


Out with the new, in with the old.
Re: 1949 Chevy dually axle
BignScar #1398681 Wed Feb 24 2021 10:02 PM
Joined: Dec 2018
Posts: 413
F
'Bolter
Bignscar My 51 6400 has that same 2-speed axle works fine !

Re: 1949 Chevy dually axle
fixite7 #1398750 Thu Feb 25 2021 07:12 AM
Joined: Feb 2021
Posts: 46
B
Wrench Fetcher
Originally Posted by fixite7
Bignscar My 51 6400 has that same 2-speed axle works fine !
That's good to hear, I'd really like to keep the rear axle.
What's your power train set-up?
My goal is to be able to drive it a lot
Have a smooth ride on the freeway
Pull a 5th wheel camper
Add 4wd
Possibly go big block, like 427 or 454 eventually
I have a 5.3 4wd powertrain I can use now though
Brought it home today.

Attached Files
20210224_164020.jpg (355.36 KB, 144 downloads)
Last edited by BignScar; Thu Feb 25 2021 07:15 AM.

Out with the new, in with the old.
Re: 1949 Chevy dually axle
BignScar #1398767 Thu Feb 25 2021 02:06 PM
Joined: Mar 2019
Posts: 1,232
G
'Bolter
Ha. Looks like your plans and punch line aint on da same page. Way cool truck tho....

Re: 1949 Chevy dually axle
BignScar #1398770 Thu Feb 25 2021 02:39 PM
Joined: Jun 2011
Posts: 3,997
E
'Bolter
Nice truck. 4wd front axle gets sort of high off the ground because stock frame does not have enough arch to allow for front driven axle to clear. Can be done OK, just have to allow for that. Look at factory late ‘50’s 4wd conversions.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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