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1951 GMC 354 24 frame modifications
#1436994 Wed Jan 12 2022 02:27 PM
Joined: Jan 2022
Posts: 20
D
dsword Offline OP
'Bolter
Hello,
I recently purchased a 1951 GMC two ton flatbed dump truck. The frame has been modified with an additional piece of steel added the makes the frame about 11 inches tall instead of the usual 8 inches. The extra piece runs from just behind the rear front spring hanger to just in front of the front rear spring hanger. Could this have been added as part of the dump bed modification?

Thanks,
David Sword

Re: 1951 GMC 354 24 frame modifications
dsword #1437001 Wed Jan 12 2022 03:39 PM
Joined: Oct 2014
Posts: 101
J
'Bolter
Yes, that was a common practice to beef up the frame rails for handling heavier loads.

Re: 1951 GMC 354 24 frame modifications
dsword #1437308 Sat Jan 15 2022 12:51 AM
Joined: May 2009
Posts: 140
3
'Bolter
My Dad called it a fish plate. They were factory installed on some trucks our 1946 COE, for example.

Mike


Direct email ml.russell1936@gmail.com
Re: 1951 GMC 354 24 frame modifications
dsword #1437324 Sat Jan 15 2022 02:25 AM
Joined: May 2015
Posts: 5,319
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Here's a pic of a welded fishplate. It's a doubler used when a frame extension is added, either bolted or welded.

Attached Files
Fish plate diamond.JPG (48 KB, 112 downloads)

Kevin
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
#2 - '29 Ford pickup restored from the ground up.
First car '29 Ford Special Coupe
Busting rust since the mid-60's
Re: 1951 GMC 354 24 frame modifications
dsword #1437384 Sat Jan 15 2022 03:16 PM
Joined: Jun 2011
Posts: 4,454
E
'Bolter
Another example of frame cut and doubling, 4’ shortening in this case rather than moving the axle fwd and cutting back end off. Flange nuts and bolts, joint welded.

Ed

Attached Files
20D3D88A-62E0-4D8C-B5BC-6CE935EA0867.jpeg (223.68 KB, 104 downloads)

'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.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: 1951 GMC 354 24 frame modifications
dsword #1437678 Tue Jan 18 2022 12:11 AM
Joined: Jan 2022
Posts: 20
D
dsword Offline OP
'Bolter
Here are some pictures. It is an L-shaped piece that runs the full length between the front and rear spring hangers. It is almost 12” tall instead of the standard 8”. It is rivited on.

Attached Files
Re: 1951 GMC 354 24 frame modifications
dsword #1438345 Sun Jan 23 2022 12:42 AM
Joined: Dec 2018
Posts: 1,444
F
'Bolter
dsword Wow tuff frame,looks like your rubber might be good too. I guess that added hight on your frame can only help,most doubled frames are a channel that fits right over the main frame. there are lots of hoists out there should be able to find a good used one.

Re: 1951 GMC 354 24 frame modifications
dsword #1438359 Sun Jan 23 2022 02:05 AM
Joined: Jan 2008
Posts: 4,801
C
'Bolter
Frames like yours were common on farm trucks. I have several with dump boxes and reinforced frames.


https://flic.kr/p/5PNznV

https://photos.app.goo.gl/1GjF1Ca8LDEnDUC87

https://photos.app.goo.gl/FT7CCM1eVLgzRcfB9

Re: 1951 GMC 354 24 frame modifications
klhansen #1438726 Tue Jan 25 2022 05:00 PM
Joined: Dec 2018
Posts: 1,444
F
'Bolter
klhansen Have had em just like that,I think it's important to use a-36 frame steel that is stretchy to make those. We used to just cut them out of junk frame,weld with 7018.


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