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Is my granddad's GMC 1/2 tonna 54 or 1st series 55? #1220323 Wed Jun 07 2017 01:55 AM
Joined: Jun 2017
Posts: 1
B
BYT Offline OP
Moderated
I wanted to know if anyone could hell me decipher
if the build plate reveals a
54 or 1st series 55?
102-24 S Z3675

Re: Is my granddad's GMC 1/2 tonna 54 or 1st series 55? [Re: BYT] #1220366 Wed Jun 07 2017 03:49 AM
Joined: Nov 2005
Posts: 1,320
H
homer52 Offline
Shop Shark
Open drive line would be 55 closed driveline 54


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Re: Is my granddad's GMC 1/2 tonna 54 or 1st series 55? [Re: BYT] #1220368 Wed Jun 07 2017 04:09 AM
Joined: Sep 2001
Posts: 28,885
tclederman Online
Boltergeist
The Z series was 1954-1955 New Design GMC.
Approximately analagous to Chevrolet Advance-Design 1954/55st.

GMC differed from Chevrolet trucks in using a series letter rather than a year.

What are the engine serial number and the engine/head date codes?

Here is info on decoding the GMC truck serial number.


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: Is my granddad's GMC 1/2 tonna 54 or 1st series 55? [Re: BYT] #1220374 Wed Jun 07 2017 04:28 AM
Joined: May 2001
Posts: 8,386
Cletis Offline
Extreme Gabster
That low serial number would have been built in 1954.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
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Re: Is my granddad's GMC 1/2 tonna 54 or 1st series 55? [Re: BYT] #1220419 Wed Jun 07 2017 04:26 PM
Joined: Jan 2013
Posts: 1,426
J
Jim Sears Offline
Shop Shark
Remember that factories were famous for using up inventory when series or years changed, resulting in trucks that were "change over exceptions".

Re: Is my granddad's GMC 1/2 tonna 54 or 1st series 55? [Re: BYT] #1220424 Wed Jun 07 2017 04:39 PM
Joined: Sep 2001
Posts: 28,885
tclederman Online
Boltergeist
102-24 would be a 1/2 ton longbed (Chevrolet trucks did not have longbed 1/2 ton trucks in that series).

Most likely you have an open drive-line/drive-shaft, whether 54 or early 55.


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: Is my granddad's GMC 1/2 tonna 54 or 1st series 55? [Re: BYT] #1220451 Wed Jun 07 2017 08:51 PM
Joined: Mar 2010
Posts: 8,613
5
52Carl Offline
Master Gabster
Did the 55.1 long bed have the u-joint enclosed in the ball, or were they exposed modern u-joints?

Re: Is my granddad's GMC 1/2 tonna 54 or 1st series 55? [Re: BYT] #1220454 Wed Jun 07 2017 09:37 PM
Joined: Sep 2001
Posts: 28,885
tclederman Online
Boltergeist
I do not know.

But, if the 55.1 GMC long-bed driveshaft was the the same as a 55st Chevrolet 3600 (same bed length), it had a fully open driveshaft (as the Chevrolet 3600 had for the first time in 1954).


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: Is my granddad's GMC 1/2 tonna 54 or 1st series 55? [Re: BYT] #1220551 Thu Jun 08 2017 05:03 PM
Joined: Jul 2002
Posts: 361
H
Hedgehog Offline
Shop Shark
From the 1954 GMC shop manual (I'll assume your copy is on order):

Model 101-22 has single a torque tube
Model 102-22 has split enclosed shafts connected via U-joint, rear shaft is identical to 101-22
Series 150-22 Front shaft is solid, rear is tubular. U-joint trunnions have needle bearing support rings.
Series PM150-22 AND UP Both shafts are tubular with the needle bearing trunnions.

When two shafts are used, there will be an extra crossmember with a center bearing supporting the front shaft.

I don't know what changes were made between the 54 and 55.1 versions of GMC trucks, but a lack of torque tube on a half ton may be the best evidence of a later model. You will find much arcane GMC knowledge at www.oldgmctrucks.com

Last edited by Hedgehog; Thu Jun 08 2017 05:12 PM.

If you can't laugh at yourself, I'll laugh at you.

Panel Beater: 1955 1st Series GMC 250-22

Moderated by  Justhorsenround 

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