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#1549266 06/11/2024 3:44 AM
Joined: Dec 2023
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'Bolter
'Bolter
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Posts: 72
Hello, can anyone identify this pto and the adapter that's bolted to the GM SM420 trans? Thanks'
Attachments
SM420 PTO spacer.jpg (303.14 KB, 172 downloads)


1959 Chev Napco 4x4 3100 w/235cu
Joined: Mar 2004
Posts: 6,214
M
'Bolter
'Bolter
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Looks like a gear reduction unit to me...spin the input shaft and count rotations on the PTO to determine what the ratio is.

Facing forward I would assume it drives a mechanical winch, but I'm just guessing.

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD
Joined: Sep 2009
Posts: 5,837
Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT
Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT
Joined: Sep 2009
Posts: 5,837
Maybe there is some helpful information from this web source ??? wink


~ Dan
1951 Chevy 3 window 3100
Follow this story in the DITY Gallery
"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
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'Bolter
'Bolter
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The PTO is forward facing for a winch. Problem is that the bell housing cross member is in the way. The 30 degree adapter re-positions it so the line line passes underneath. The PTO appears to be a Dana/Spicer(from research). I'm trying to identify the adapter now so I can attempt to locate one. No luck so far.


1959 Chev Napco 4x4 3100 w/235cu
Gdads51 #1549446 06/13/2024 6:15 AM
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'Bolter
'Bolter
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Thanks for the Muncie site. I will call them tomorrow.


1959 Chev Napco 4x4 3100 w/235cu
Joined: Feb 2004
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Kettle Custodian (pot stirrer)
Kettle Custodian (pot stirrer)
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That PTO closely resembles one I had on a heavy haul wrecker. It powered a 35 ton belly winch, and it had forward and reverse direction capability. I believe the fwd and rev ratios were slightly different due to different tooth count gears inside the PTO. I don't remember a PTO brand name or part number- - - -I managed that wrecker service in the late 1990s.


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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'Bolter
'Bolter
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Finding an adaptor that fits a transmission that hasn't been made for over 50 years is going to be real hard...

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD
Mike B #1550435 06/23/2024 11:00 PM
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'Bolter
'Bolter
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True. Pretty much the same with about everything on these old trucks.


1959 Chev Napco 4x4 3100 w/235cu
3100Apache1959 #1550441 06/23/2024 11:52 PM
Joined: May 2015
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Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Joined: May 2015
Posts: 11,052
Another possibility is Chelsea.
They were/are a manufacturer of PTOs.


Kevin
1951 Chevy 3100 work truck
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