G-506 drive shafts

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43chev
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G-506 drive shafts

Post by 43chev » Mon Jun 14, 2021 1:38 am

Hi guys ,
Was wondering if the g-506/85 drive shafts are the same a civilian. 1.5ton trucks and if the civi ones can be used ( obviously different lengths)


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Re: G-506 drive shafts

Post by forestry4evr » Mon Jun 14, 2021 8:48 am

I would imagine that the u-joints are the same series (1350 i recall) on both civilian and military war period applications. I have a 1946 civilian non-synchro 4 speed transmission and the output yoke is the same as military. Keep in mind that both the front and rear driveshafts on all of the 145 inch wheelbase trucks are identical.
1941 G4112 Chevrolet with Hercules dump bed

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Re: G-506 drive shafts

Post by M35a2duece » Mon Jun 14, 2021 11:50 am

I believe some civilian Chevy trucks are torque tube rear ends aren’t they? I thought that’s why the transmission is the same but not the rear output area. Not sure tho, just going from memory

43chev
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Re: G-506 drive shafts

Post by 43chev » Tue Jun 15, 2021 12:19 am

1940 and 1946 had torque tubes and maybe the pickups

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Re: G-506 drive shafts

Post by 43chev » Tue Jun 15, 2021 12:20 am

Thanks thought they would be




quote=forestry4evr post_id=1887632 time=1623689290 user_id=29032]
I would imagine that the u-joints are the same series (1350 i recall) on both civilian and military war period applications. I have a 1946 civilian non-synchro 4 speed transmission and the output yoke is the same as military. Keep in mind that both the front and rear driveshafts on all of the 145 inch wheelbase trucks are identical.
[/quote]

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Re: G-506 drive shafts

Post by forestry4evr » Tue Jun 15, 2021 2:52 am

The 1 1/2 ton civilian trucks use an open driveshaft arrangement, at least from 1938 up.
1941 G4112 Chevrolet with Hercules dump bed

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Re: G-506 drive shafts

Post by M35a2duece » Tue Jun 15, 2021 7:26 am

forestry4evr wrote:
Tue Jun 15, 2021 2:52 am
The 1 1/2 ton civilian trucks use an open driveshaft arrangement, at least from 1938 up.
Good to know! Isnt the transmission on the half, 3/4 and 1 tons the same minus the driveshaft output and the first gear ratio?

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Re: G-506 drive shafts

Post by forestry4evr » Wed Jun 16, 2021 3:03 am

There are a lot of common internal and external parts between the civilian and military Chevy 4 speed transmissions. A friend and I chased this rabbit years ago...I don't recall the exact details, but there are some internal differences among the early transmissions 1937-41 vs 1942-47. If one digs into the specifications, the first run YP trucks had slightly different gear ratios than the rest of the ZP and N series transmissions. Overall though, a civilian 4 speed from any 1 1/2 truck will bolt up and work in a G506. The speedometer output must be blocked when using the civilian transmission in a G506.
1941 G4112 Chevrolet with Hercules dump bed

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Re: G-506 drive shafts

Post by 43chev » Thu Jun 17, 2021 2:59 am

Why does it need to be blocked ?

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Re: G-506 drive shafts

Post by retro-roco » Thu Jun 17, 2021 10:14 am

43chev wrote:
Thu Jun 17, 2021 2:59 am
Why does it need to be blocked ?
Because the speedometer cable is driven from the Transfer case, and not the transmission.
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