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Auxiliary transmission ?
#1328706 Fri Oct 04 2019 01:52 AM
Joined: Feb 2011
Posts: 1,007
T
Shop Shark
Did GM ever offer them in any of their trucks? I know the power divider / auxiliary 3 speed for the tandems was offered in TF trucks. How about dealer options?


Ret, Machinist , Industrial Engine
Engine specialist
Re: Auxiliary transmission ?
Truckrolet #1328710 Fri Oct 04 2019 02:22 AM
Joined: Jun 2011
Posts: 3,547
E
Shop Shark
There are a lot of GM trucks with Brownies, hard to believe they weren't offered at least through dealer.

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: Auxiliary transmission ?
Truckrolet #1328714 Fri Oct 04 2019 02:46 AM
Joined: Nov 2005
Posts: 5,685
3
3B Offline
Master Gabster
Hy Truckrolet, I just went through my 1959 Chevrolet truck sales data book just to be sure, but as I thought no auxiliary transmissions were listed for any of the trucks other than the ones you mentioned in your question, hope that helps.

Re: Auxiliary transmission ?
Truckrolet #1328725 Fri Oct 04 2019 04:41 AM
Joined: Feb 2011
Posts: 1,007
T
Shop Shark
Thank you. And the problem with someone installing something like that its not always done correctly. Just wondering if dealers ever offered such things. The particular truck is supposed to have a 4 speed. When the fellow mentioned a spliter I asked if he meant a 2 speed rear axle, nope its a transmission behind the 4 speed. Just wondering what kind of scabbed up mess it all is.


Ret, Machinist , Industrial Engine
Engine specialist
Re: Auxiliary transmission ?
Truckrolet #1328820 Sat Oct 05 2019 12:28 AM
Joined: May 2005
Posts: 9,146
G
.
I removed a 4 speed Spicer auxiliary from a 1965 80 series.
I’m about 99% sure it was factory and if it wasn’t then it was a very well designed install kit that looked as if factory.
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=909513

Pictures in the later half of this album. https://goo.gl/photos/7X9t8keUfeooJbvx5

Last edited by Grigg; Sat Oct 05 2019 12:36 AM. Reason: more info

1951 GMC 250 in the Project Journals [stovebolt.com]
1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup [stovebolt.com]
---All pictures [picasaweb.google.com]---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: Auxiliary transmission ?
Truckrolet #1328827 Sat Oct 05 2019 12:44 AM
Joined: May 2005
Posts: 9,146
G
.
Looking in the 1949-53 GMC models 400-980 parts book the index list auxiliary transmission in section 7.5200.
That section is really for speedometer adapters but list some of those for use with model 6231 and 8031 auxiliary transmissions.

I don't know what that says for the auxiliary being factory installed or not.


1951 GMC 250 in the Project Journals [stovebolt.com]
1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup [stovebolt.com]
---All pictures [picasaweb.google.com]---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: Auxiliary transmission ?
Truckrolet #1328887 Sat Oct 05 2019 02:21 PM
Joined: Jun 2011
Posts: 3,547
E
Shop Shark
I have also removed aux. trans like Grigg has, they all looked professionally done, they are listed is service manuals in many GM trucks.

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.

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