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Re: [oletrucks] Transmissions (2): Overdrive?

To: The Perfesser <driver@49chevy.com>
Subject: Re: [oletrucks] Transmissions (2): Overdrive?
From: Thomas Allen <thallen@nwlink.com>
Date: Wed, 05 Dec 2001 10:50:47 -0800
Paul,

Regarding your three-speed trans: As your shop suggests the basic problem 
is that the transmission is really too light duty for the job. Chevrolet 
didn't anticipate that they would be in service so long. This is basically 
the same transmission as in the cars and there were internal variations 
over the years. The second problem your shop faces is that they are forced 
to use used parts either because they don't know where to get them or they 
are unavailable. I had the problem you describe on a 48 3100 many year back 
so the memory is a little fuzzy by now but as I remember the synchro hub 
assembly was worn and would allow the synchro ring to rotate inside the hub 
just enough for the teeth on the synchro ring and teeth on the second speed 
gear to become misalligned after the transmission was shifted into second 
gear. The soultion is a new second/third shift hub assembly. This is the 
gizmo that sits on the main shaft between the second speed gear and the 
main drive gear. I was in college when I had this problem and had no money, 
so I tried various combinations of used parts until I came up with 
something that worked. At $50/hr or more you can't afford to do what I did. 
So go find a new shift assembly. going to the 48-66 Saganaw 4-speed is an 
option as these were offered in the half tons and can be found with the 
bell on the end for the torque tube. You won't wear one of these out with a 
6 cyl in  a half ton. Try to get on that came out of a half ton rather than 
a 2 ton.

-Tom
51 3800

At 10:57 AM 12/5/01 -0600, The Perfesser wrote:
>Hello again,
>
>In addition to the preceding magnum opus about transmissions and drive
>chains, one of my advisors has suggested I research transmissions with
>overdrive as an alternative to changing the ring and pinion in the rear end.
>
>Are there any transmissions with Overdrive that might be suitable for a
>truck such as mine (1949 3100) ?
>
>The thought is that if I'm going to have to replace the transmission, I
>might consider doing it with one that offers over drive;
>The suspicion is that overdrive, if it exists at all, did not come along
>until much later, and so would likely not be compatible with my old-style
>"closed" drive shaft.
>
>You know how it is with the old girls... tummy tuck here requires a thigh
>lift there...
>
>--PS
>
>
>- - - - - - - - - - - - - - - - - - - - - - -
>Paul Schatzkin, aka The Perfesser
>http://www.theperfesser.com
>
>1949 Chevy 3100
>http://49chevy.com
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

Tom Allen
Seattle, WA
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

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