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1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
#1361912 Mon May 25 2020 08:16 PM
Joined: Jan 2019
Posts: 232
P
Philipj Offline OP
Shop Shark
Hello there,

I am looking for the front section of the torque tube on my 1939 (1.5 ton) 158-1/2" wheelbase truck... It may be GM 3654084. Is there anything else that would need replacement while refitting the drivetrain to original configuration or anything to watch out for? Thank you.

Attached Files
DSC_6916 - Copy R - Copy_LI.jpg (121.29 KB, 121 downloads)
DSC_6904 (1) R.JPG (196.78 KB, 123 downloads)
DSC_6861 - Copy R.JPG (298.19 KB, 115 downloads)
Last edited by Philipj; Wed May 27 2020 11:05 PM.

Philippe Jeanneau
Re: 1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
Philipj #1361974 Tue May 26 2020 03:22 AM
Joined: Jun 2011
Posts: 3,603
E
Shop Shark
What are the symptoms you are experiencing suggesting the driveshaft/torque tube needs replacing?

Ed


'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: 1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
Philipj #1362084 Tue May 26 2020 09:35 PM
Joined: Jan 2019
Posts: 232
P
Philipj Offline OP
Shop Shark
Hello Ed,

No such thing, I want to eliminate the fire water pump (middle photo) and bring the truck back to normal configuration (first photo) ...

Last edited by Philipj; Tue May 26 2020 09:36 PM.

Philippe Jeanneau
Re: 1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
Philipj #1362208 Wed May 27 2020 01:15 PM
Joined: Jun 2011
Posts: 3,603
E
Shop Shark
So, looking at your photos, looks like you have a short conventional driveshaft to the pump, then pump, then remainder torque tube to rear? I have replaced pumps on several trucks with Brownies, however, never saw a Brownie with a
TT output.

I guess you could gut the pump so it drives nothing.

Ed


'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: 1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
Philipj #1362213 Wed May 27 2020 01:32 PM
Joined: Jan 2019
Posts: 232
P
Philipj Offline OP
Shop Shark
I just would like to remove all that useless weight and bring back to standard configuration... Yes, even a Brownie box would be nice with that, but they're impossible to find...


Philippe Jeanneau
Re: 1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
Philipj #1362252 Wed May 27 2020 05:01 PM
Joined: Jun 2011
Posts: 3,603
E
Shop Shark
I have several, however, the torque tube problem would still exist. Probably with no Hills in FL, an OD would be helpful.

Ed


'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: 1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
Philipj #1362259 Wed May 27 2020 05:32 PM
Joined: Jan 2019
Posts: 232
P
Philipj Offline OP
Shop Shark
Hello Ed,

What would you need for the front section? I'm not worried about anything else other than being able to put the truck back together as it was originally... The length of the front section is approximately 49-3/4"...

Now, I would forget about that if you told me that you have everything to convert this to an open driveshaft...:)

Last edited by Philipj; Wed May 27 2020 05:33 PM.

Philippe Jeanneau
Re: 1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
Philipj #1362295 Wed May 27 2020 08:53 PM
Joined: Mar 2004
Posts: 4,606
M
Shop Shark
What's the back half of the drive shaft look like...is it a standard open shaft?

Could you put a cross member in to carry the back of the existing TT off of the trans and connect from that existing U-joint back to the rear U-joint with a new longer shaft?

Mike B smile

Re: 1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
Philipj #1362297 Wed May 27 2020 08:57 PM
Joined: Jan 2019
Posts: 232
P
Philipj Offline OP
Shop Shark
The back has the standard torque tube...It would be more difficult to fabricate something that might work. It would seem easier in my book to find the original part that went there in the first place...

Attached Files
thumbnail_IMG_0675.jpg (39.56 KB, 44 downloads)
Last edited by Philipj; Wed May 27 2020 08:59 PM.

Philippe Jeanneau
Re: 1939 (VC) 1.5 ton truck. 158-1/2" WB -Front Prop Shaft...
Philipj #1362317 Wed May 27 2020 10:24 PM
Joined: Jun 2011
Posts: 3,603
E
Shop Shark
Probably need to find a truck w/o pump, probably hard to find, but newer similar truck might be the same.

Another option, depending on your proposed use might be to find a modern rear axle, 14 bolt for example, open driveline, and pick a suitable ratio, of course then one has to match the front wheel bolt pattern. Are you going to keep the original engine? 2 ton front axle can be fitted with P-30 disc brake hubs to keep a narrow axle to fit in the fenders.

Ed


'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.
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