Steve:
I have a friend who had a shop put a 350/350 in his 56 GMC that did exactly
what you are asking about. The pattern on the shifter has five positions
reading left (shift lever all the way up) to right (shift lever all the way
down):
N 4-1 3-1 2-1 R
N is neutral and is where the lever must be to start the truck
4-1 is "drive" Uses all 4 gears
3-1 uses 1st, 2nd and 3rd gears, but not 4th.
2-1 uses second gear only unless you mash the throttle hard enough to get
through the detent, then it will downshift to 1st.
R is reverse. The Dual-Range Hydra-Matics had no "park" position. When in
reverse and there is no pump pressure in the transmission (i.e. the engine
isn't running) the parking pawl drops in locking the driveshaft. Makes for an
interesting phenomena when you are backing out of the driveway and the engine
stalls. Getting the lever into the R position requires the user to pull the
handle towards himself slightly. There are no other detents in the shift
linkage.
The markings for the five positions are on a removeable piece of clear plastic
that has been painted on the back to allow the light from the buld behind to
shine through the lettering.
My friend stayed with the stock plastic piece, but I'd bet someone with a
Dremel tool working on some 1/4" plexiglass could turn out a pretty good
replacement marked P R N D L. Because there are no detents in the linkage you
could probably even make one with six positions P R N D2 D1 L.
The "under the floorboard" end of the shift mechanism is a lever that is about
2-3" long. If you need information about how much movement occurs from N to R
let me know and I'll measure mine.
-----Original Message-----
From: Steve Hanberg [mailto:steve@oldsub.com]
Sent: Wednesday, June 19, 2002 9:25 AM
To: Hanlon, Bill; oletrucks@autox.team.net
Subject: Re: [oletrucks] transmission tools
I don't have an old Hydra-Matic, but I am curious what the shifter looked
like for one of these. I have a 1st series '55 GMC in which I am
considering replacing the 4-speed with a 350 Turbo. While I'm not opposed
to updating, I'd like to keep some of the character, and an original type
shifter would help do that.
Can you, or anyone else, describe the shifter used with the Hydra-Matic?
steve@oldsub.com
----- Original Message -----
From: "Hanlon, Bill" <Bill.Hanlon@hp.com>
To: "Wayne Osborne" <wayne@chevytrucks.org>; <oletrucks@autox.team.net>
Sent: Wednesday, June 19, 2002 6:02 AM
Subject: RE: [oletrucks] transmission tools
> If anyone needs Hydra-Matic info for some specific purpose, I've managed
to accumulate a fair collection.
>
> Maintenance Manual GMC Truck Hydra-Matic Transmission Operation and
Maintenance x-5706. Specific to GMC truck Hydra-Matics. 139 pages. This
has all the adjustments using special tools.
>
> GM Hydra-Matic Transmission Parts Catalog Bulletin 37A-100. Complete
parts listings and drawings for ALL Hydra-Matics from 1940 to 1957. 27
pages of Chevy Truck, 48 pages of GMC Truck.
>
> Hydra-Matic Overhaul Practices for GMC Trucks X-5844. 38 pages plus 35
pages of The Shop Requisition for GMC Hydra-Matic Parts.
>
> Hydra-Matic Drive Principles of Operation - Detroit Transmission
Division 63 pages
>
> Hydra-Matic Transmission Service Manual, A Paul Marsh Publication 1956.
262 pages of theory, on-vehicle adjustments and overhaul instructions.
Shows how to make many adjustments without the special tools.
>
> United Delco Transmission Parts Application Catalog - 1968. Covers most
GM automatic transmissions from 1946-1964 including 30 pages on Dual Range
Hydra-Matic as used in GMC and Chevy trucks.
>
> Plus there are 17 pages on Hydra-Matic linkage adjustments in the
Maintenance Manual GMC Trucks Models 100 thru 500 X-5703. This is the
reprint maintenance manual that is currently available through most of the
OleTruck parts vendors.
>
> Also see http://members.aol.com/autotran3/HMBAdj1.html for how to do band
adjustments without Kent-Moore tools.
>
>
> -----Original Message-----
> From: Wayne Osborne [mailto:wayne@chevytrucks.org]
> Sent: Tuesday, June 18, 2002 8:43 AM
> To: oletrucks@autox.team.net
> Subject: [oletrucks] transmission tools
>
>
> received the below the other day--anyone know is any of these tools are
> available and is so--who sells 'em.. --wayne
>
> I HAVE A 1956 CHEVY TRUCK ALSO AND I WANT TO RESTORE IT. MINE HAS A
> HYDRO/MATIC TRANSMISSION AND I NEED THE ADJUSTING TOOLS THAT PUT THE
PROPER
> TORQUE ON THE FRONT AND REAR BANDS. THE TOOLS I NEED ARE #1 FRONT SERVO
> GAUGE #J1693-A #2 SERVO BAND ADJUSTER #J2681-A AND #3 REAR SERVO GAUGE
> #J5071 I KNOW THAT THESE ITEMS ARE NOT MANUFACTURED ANY MORE BUT I HOPE
> THAT YOU WILL KNOW WHERE I CAN PURCHASE THESE ITEMS. I HAVE BEEN ALL OVER
> THE WEB LOOKING FOR SOMEONE WHO HAS THESE ITEMS AND WILL SELL THEM. THANK
> YOU FOR YOUR TIME AND HELP IF I AM IN THE WRONG AREA PLEASE POINT ME IN
THE
> RIGHT DIRECTION SO THAT I CAN GET MY CHEVY TRUCK UP AND RUNNING. AGAIN
YOUR
> TRUCK IS WONDERFUL THANKS DEAN CARMICHAEL
>
>
>
>
>
> Wayne Osborne
> 1956 Chevy Pickup
> LaGrange Ga.
> http://www.chevytrucks.org
> http://www.chevytrucks.org/wayne
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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