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55 GMC Series 1 Project #1331059 Thu Oct 24 2019 05:11 PM
Joined: Oct 2019
Posts: 6
M
msmalley Offline OP
New Guy

Hello Everyone I am new to the post and new to restoring so looking forward to all the help. I have a 1955 GMC series 1 deluxe 5 window that is pretty much all original except it was converted to 12 volt before I purchased it in 1982. It is my first truck and I drove it couple of years in high school and parked it 1985 when I went into the service. Life took over and it stayed in the field until last month when I picked it up and trailered it down to Texas. I know shame on me, but hey it is spilled milk so I will have to just deal with it. It was running, but had a miss so will want to rebuild the motor, it is a numbers matching 248 connected to a hydramatic 100 trany and a torque tube rear end. The u joints made a lot of noise when I would let off the gas so I know that they need attention. I have lots of questions on the best way to get started etc, but I would like to know if it is worth rebuilding the torque tube and rear end. I would like to change the ring and pinion for drivability which I have seen in the post but haven't found any information on rebuilding the torque tube. The hydramatic was working fine when I was driving it but that was 34 years ago. I have no problem rebuilding the motor, but should I attempt the trany? Is it worth saving any of it or should I change out the trany and rear end for an open drive line? I know that I have written a book here sorry if that is not cool but wanted to get this started. I like doing a lot of research before I start a project so that I have a plan to follow. Thanks in advance for your help.

Attached Files
Truck Reduced 2.jpg (224.76 KB, 136 downloads)
Truck Reduced.jpg (265.6 KB, 128 downloads)

1955 GMC Series 1
100 Series 1/2 Ton Long Bed
248 to a Hydramatic 100
Re: 55 GMC Series 1 Project [Re: msmalley] #1331080 Thu Oct 24 2019 08:52 PM
Joined: Apr 2005
Posts: 7,880
Justhorsenround Offline
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Welcome to the Stovebolt madness. There is no cure! shake


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

Re: 55 GMC Series 1 Project [Re: msmalley] #1331086 Thu Oct 24 2019 09:43 PM
Joined: Dec 2018
Posts: 447
A
Apache1 Offline
Shop Shark
Welcome aboard! Good story and good project. 1955 a good year for vehicles. Good Luck. Keep the questions coming...there is a boat load of expertise affiliated with this site.


1959 Apache 3100 Fleetside SWB (Shop Truck) (modified)




Re: 55 GMC Series 1 Project [Re: msmalley] #1331089 Thu Oct 24 2019 10:09 PM
Joined: Sep 2001
Posts: 28,911
tclederman Offline
Boltergeist
msmalley,

Welcome to Stovebolt.com
You might want to also check out oldGMCtrucks.com
That year GMC engine and dash/gauges are different from a Chevrolet truck.
Brakes and most front end parts would most likely be the same.

Most likely you have a 100 series - 1/2 ton?
A Maintenance Manual should be available from parts vendors.
Here is an early 1955 manual with info on the H-M transmission.

You might as well drain the transmission and put in the correct fluid.
I do not recall if there is a transmission filter (members here should know).
That is a complicated transmission, if it needs repair.
The good news is that it is a good/strong transmission - it might need repairs.

Look here in the Tech Tips for advice on checking out a new truck.

In the Tech Tips, look at the 3.55 Ring & Pinion conversion (for a 3.55 ratio, instead of the 3.90 ratio).
You would need to obtain a 1948-1953 ring-gear carrier (GMC or Chevrolet 1/2 ton).

Last edited by tclederman; Thu Oct 24 2019 10:34 PM. Reason: added link to manual

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- 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 engine are not "splash oilers" - this is a splash oiler.
Re: 55 GMC Series 1 Project [Re: msmalley] #1331090 Thu Oct 24 2019 10:14 PM
Joined: Dec 2015
Posts: 2,028
69Cuda Offline
Big Bolt Forum Moderator
welcome ti the site! Sorry, I am not going to be any help on your questions so far!


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
In the Stovebolt Gallery


1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery

1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof
Re: 55 GMC Series 1 Project [Re: msmalley] #1331106 Fri Oct 25 2019 12:14 AM
Joined: Dec 2001
Posts: 14,803
Achipmunk Offline
Extreme Gabster
msmalley, welcome to the Stovebolt.

Note: you have a nice looking truck, especially compared to what a lot of us here started with. Tons of knowledge here on the Bolt so don't be bashful......BUT, to get answers to your questions it is best to ask them in the garage forums for best results. Pick the forum your question is best suited for......like torque tube questions in the Driveline Forum.

Good luck, and remember, we're here to help. Also, there are lots of members here that belong to the "Texas Connection" so watch for them....you may have a bolter next door!!!


1937 Chevy Pickup
1952 Chevy Panel
Pictures in my Photobucket
1950 Chevy Coupe

52 Chevy Panel

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile
Re: 55 GMC Series 1 Project [Re: msmalley] #1331107 Fri Oct 25 2019 12:15 AM
Joined: Dec 2002
Posts: 3,175
Rusty Rod Online
Moderator - The Electrical Bay and Rocky Mountain Bolters
Welcome to the 'bolt. Thats a neat looking truck you have. Please ask your questions in the applicable forums, as that is where you will get the best and fastest answers.


Another quality post.


Real Trucks Rattle

HELP! The Paranoids are after me!
Re: 55 GMC Series 1 Project [Re: msmalley] #1331151 Fri Oct 25 2019 12:50 PM
Joined: Nov 2004
Posts: 1,550
J
J Lucas Offline
Shop Shark
Welcome msmalley. What a nice truck. I'm looking forward to following your build. Just curious, where did you trailer it down from?

John


J Lucas





1941 Chevy 1/2-Ton
1942 Chevy 1.5-Ton SWB
1959 Chevy Apache 31 Fleetside
1959 Chevy Apache 32 Fleetside
1959 Chevy Viking 40

My Flicker Photos!

Re: 55 GMC Series 1 Project [Re: msmalley] #1331154 Fri Oct 25 2019 01:06 PM
Joined: Mar 2007
Posts: 427
T
TUTS 59 Offline
Shop Shark
Welcome msmalley. Nice solid truck. Glad to see I'm not the only one who took a 30 year break grin


Craig

Come,Bleed or Blister somethings got to give!!!
Q:"What yah runnin"
A:"3/8 drive Black and Decker aquarium pump motor" (the movie HOTROD)

59' Apache 31, long term project (30 years and counting)
Re: 55 GMC Series 1 Project [Re: msmalley] #1331167 Fri Oct 25 2019 02:49 PM
Joined: Jun 2001
Posts: 700
T
TrknGMC Offline
Bondo Artiste
Welcome to the Stovebolt Page! Nice looking GMC . Really like the hood ornament, stainless windshield trim!


Phillip
1927 Chevy Capital 1 Ton truck - basket case
1941 Chevy Suburban - Parts only
1949 GMC Suburban - 10 year project
1945 GMC half ton truck - Driver
1946 Chevy COE - Might restore one day...

https://photos.google.com/u/1/albums
Re: 55 GMC Series 1 Project [Re: J Lucas] #1331417 Sun Oct 27 2019 08:20 PM
Joined: Oct 2019
Posts: 6
M
msmalley Offline OP
New Guy
Originally Posted by J Lucas
Welcome msmalley. What a nice truck. I'm looking forward to following your build. Just curious, where did you trailer it down from?

John

Hello John, I brought it down from South Dakota, it was purchased in Mitchel SD and spent most of its life in Rapid City sadly a lot of that was in a field.


1955 GMC Series 1
100 Series 1/2 Ton Long Bed
248 to a Hydramatic 100
Re: 55 GMC Series 1 Project [Re: tclederman] #1331422 Sun Oct 27 2019 08:38 PM
Joined: Oct 2019
Posts: 6
M
msmalley Offline OP
New Guy
Hi Ya all,

Thank you so much for the warm welcome and advice thus far I really appreciate it. I am relieved that there are so many out there willing to help, I have posted the same message on other boards and have not received any feed back. I thought that I would receive an email when there was a reply to my post but I haven't received any. I will check my settings. I will also post my technical questions in the correct forums. Really looking forward to kicking this off.


1955 GMC Series 1
100 Series 1/2 Ton Long Bed
248 to a Hydramatic 100
Re: 55 GMC Series 1 Project [Re: tclederman] #1331428 Sun Oct 27 2019 08:55 PM
Joined: Oct 2019
Posts: 6
M
msmalley Offline OP
New Guy
Originally Posted by tclederman
msmalley,

Welcome to Stovebolt.com
You might want to also check out oldGMCtrucks.com
That year GMC engine and dash/gauges are different from a Chevrolet truck.
Brakes and most front end parts would most likely be the same.

Most likely you have a 100 series - 1/2 ton?
A Maintenance Manual should be available from parts vendors.
Here is an early 1955 manual with info on the H-M transmission.

You might as well drain the transmission and put in the correct fluid.
I do not recall if there is a transmission filter (members here should know).
That is a complicated transmission, if it needs repair.
The good news is that it is a good/strong transmission - it might need repairs.

Look here in the Tech Tips for advice on checking out a new truck.

In the Tech Tips, look at the 3.55 Ring & Pinion conversion (for a 3.55 ratio, instead of the 3.90 ratio).
You would need to obtain a 1948-1953 ring-gear carrier (GMC or Chevrolet 1/2 ton).


Tim,

Thank you very much for all of the advice. Yes this is a 100 Series 1/2 ton, and I will check on the manuals. I have visited the OldGMCTrucks site, it was actually the first site I found in my search. I tried to join but I never received a confirmation email from them so I think that the site isn't active. I have gone thru the site and downloaded all the information that I thought was relevant to my truck. I am surprised at the lack of information available for older GMC's on the web. I will repost my drive train questions on the correct forum, but it sounds like it would be worth sticking with the original kit. I just didn't want to go through all of the time and work to keep it if it wasn't going to add any value.


1955 GMC Series 1
100 Series 1/2 Ton Long Bed
248 to a Hydramatic 100
Re: 55 GMC Series 1 Project [Re: msmalley] #1332215 Fri Nov 01 2019 10:10 PM
Joined: Jul 2018
Posts: 63
S
Steelonsteel Offline
Wrench Fetcher
Welcome , MS , and what a beautiful truck! Sounds like you’re settled down there in Katy.
I’m an old Texan myself, though long ago.
That deluxe model, with hydramatic, is to me , worth keeping original. What a pleasure to drive .
This must have been the very last GMC new design bodies! I feel the one piece windshield in the old body style in the 54 55
trucks was already a customized look. A rare and original, keep it, enjoy it!


I have a large carbon footprint. That’s why my wife makes me take off my boots in the house.
1963 Chevy half ton stepside short box 230
1954 GMC 3 ton 302
And several more Chevy camper and work trucks 1979 1987 1996
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