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Can anyone ID this 2-speed rear? #1204005 Sun Feb 12 2017 05:57 PM
Joined: Jul 2014
Posts: 22
B
Brad Johnson Offline OP
New Guy
This (currently disconnected) 2-speed rear end belongs to my wife's 1941 GMC 2.5 ton (CC403). Originally a fire truck, the Department disconnected it, leaving it in low range, since they had no one left who could operate it (1990's - kids today lol!). Seem like high range would be handier if I had to pick just one, for road speed (45 mph). Anyone know what it is?

Brad

https://drive.google.com/file/d/1SmV9NMuCNZJUmyxVRTwDcWsSMoiA3xLqsg/view?usp=sharing
https://drive.google.com/file/d/1XT9dkrCqTYlErzGf_c45xoIsw4P12SUnrw/view?usp=sharing

Re: Can anyone ID this 2-speed rear? [Re: Brad Johnson] #1204012 Sun Feb 12 2017 06:30 PM
Joined: Jun 2004
Posts: 8,160
W
Wrenchbender Ret. Offline
Master Gabster
It looks to be manually operated. Most ive worked with were electric or vacuum. You could disconnect the lever from the cable & see if The high side works or if it is in fact on the low side. If that changes it to the high side you could wire it in that position or hook up the cable & repair it to work.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: Can anyone ID this 2-speed rear? [Re: Brad Johnson] #1204103 Mon Feb 13 2017 05:09 AM
Joined: Jun 2011
Posts: 3,111
E
EdPruss Offline
Shop Shark
Whatever it is, the ratios are slow and slower, so, look for some modern 2 speed with higher ratios. 2 speed axles are usually listed or stamped on housing by high ratio only.

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.
Re: Can anyone ID this 2-speed rear? [Re: Brad Johnson] #1204126 Mon Feb 13 2017 01:33 PM
Joined: Dec 2012
Posts: 208
E
Ed Hotaling Offline
Shop Shark
As Wrenchbender said, it is mechanically shifted like the transmission. If the lever is still in place, it should not be hard to hook back up. Shifting it will take some learning, but it will be a skill to show off.

Re: Can anyone ID this 2-speed rear? [Re: Brad Johnson] #1204152 Mon Feb 13 2017 05:25 PM
Joined: Nov 2005
Posts: 5,567
3
3B Offline
Master Gabster
Hy Brad Johnson, that is a double reduction Timken differential very heavy duty and heavy. This was the standard axle for your truck, hope that helps.


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