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Re: 1950 Chevy 6100 NAPCO 4X4
Napco Man #1350554 Wed Mar 18 2020 08:03 PM
Joined: May 2017
Posts: 349
S
'Bolter
I do not own a NAPCO anything, but they were made about 10 miles from my home, in Hopkins, MN. I have been in the building since they moved out of it, down the street to a new address. The building will be or already has been removed to make room for a street and some light rail something or other.

Somewhere around here I have some sales literature from about 1957 I think extolling the virtues of the Chevrolet Mountain Goat, 3/4 ton Suburban - Napco conversion.

I believe the axles were manufactured for Chevrolet by Eaton and modified by Napco for the front drive. I believe all the parts are the same, front and rear except for the axle shafts and the steering parts.

People ask me regularly if my '62 K10 is a Napco, it is not, it has an Eaton/Chevrolet rear and a Dana 44 front with a Timken 4 shaft transfer. My transfer case is similar to the pictured Napco with 1 front and two rear outputs but the pto opening on the rear is not used for driving a second axle, it is still available when used with tandems.

One day I will run across the Napco literature and I will post it up, it is a sales package for a dealer and includes original 8x10 photos (not prints but original photographs).


Mac :{)

1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
Re: 1950 Chevy 6100 NAPCO 4X4
Napco Man #1350799 Fri Mar 20 2020 01:05 PM
Joined: Nov 2011
Posts: 2,655
P
'Bolter
George,

Thanks for the images. Yes it does look like NAPCO borrowed components from the WW2 era Chevy 4x4. There are a couple of slight differences such as the front axle to spring attachment arrangement and the speedometer cable location, otherwise the basic components and major castings look identical. Interesting to note that your axle hubs are 5 bolts vs the military 6 bolt. I wonder what type of parts concoction NAPCO came up to make that arrangement? Makes me think that there may be some GM off the shelf spindle and hub compatibility.

The attached images are from my 1941 Chevy GI 4x4.

Are the ring/pinion on your NAPCO 1:6.67?

Paul

Attached Files
2013-05-27 18.33.45.jpg (307.87 KB, 157 downloads)
IMG_1127 (1).JPG (215.45 KB, 153 downloads)
Last edited by Paul_WNC; Fri Mar 20 2020 01:12 PM.
Re: 1950 Chevy 6100 NAPCO 4X4
Napco Man #1351046 Sat Mar 21 2020 09:11 PM
Joined: Apr 2007
Posts: 381
N
Shop Shark
That’s a beautiful setup Paul! I wish mine was in that condition. My gear ratio is 6:17, which I think is standard for Chevy 2 tons.

Take care,
George

Re: 1950 Chevy 6100 NAPCO 4X4
Napco Man #1351234 Mon Mar 23 2020 01:00 AM
Joined: Nov 2011
Posts: 2,655
P
'Bolter
The M211/M135 trucks used an Eaton style axle with the same gear ratio. Interesting...

Re: 1950 Chevy 6100 NAPCO 4X4
Napco Man #1352085 Sat Mar 28 2020 02:54 PM
Joined: Apr 2007
Posts: 381
N
Shop Shark
I also have a 1987 Chevy C70 4x4 dump truck that was previously a firetruck that has a similar transfer case. Any idea whether it might be a suitable replacement if the original goes out? If the axle wasn't so wide it would be a sweet swap into a Big Bolt.

Take care,
George

Attached Files
20200328_101727.jpg (393.54 KB, 92 downloads)
20200328_101711.jpg (434.24 KB, 92 downloads)
20200328_101823.jpg (224.28 KB, 91 downloads)
20200328_101913.jpg (250.09 KB, 90 downloads)
Re: 1950 Chevy 6100 NAPCO 4X4
Napco Man #1352097 Sat Mar 28 2020 04:03 PM
Joined: Nov 2011
Posts: 2,655
P
'Bolter
The transfer case in your 1987 Chevy looks considerably different. Drivetrains in the WW2 era were kind of oddball. Both the front and rear differentials have identical parts, same ring and pinion for front and rear. To accommodate, the front axle pinion is mounter real high rotating the assembly the opposite direction as the rear with its low mounted pinion. Both front and rear transfer case output shafts rotate in the same direction.

Re: 1950 Chevy 6100 NAPCO 4X4
Napco Man #1352114 Sat Mar 28 2020 05:54 PM
Joined: May 2017
Posts: 349
S
'Bolter
Your transfer case looks like the one that is in my '62 K10, I believe it is called the Timken 4 shaft. It has provisions for an input at the top front, a PTO at the top rear, two outputs at the bottom rear for tandem axles, and a single output at the bottom front. All outputs rotate in the same direction as the input.

The NAPCO transfer has similar outputs but the front shaft rotates opposite to the input. I don't know which way the PTO output rotates.


Mac :{)

1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
Re: 1950 Chevy 6100 NAPCO 4X4
Napco Man #1352146 Sat Mar 28 2020 08:50 PM
Joined: Apr 2007
Posts: 381
N
Shop Shark
Thanks gents. I know the appearance is different, but was wondering if it would be a possible replacement since it’s a divorced case with a drivers side pumpkin. Someone mentioned a backwards spin earlier and I was wondering if this t-case would work in a NAPCO. These cases are supposed to be bulletproof, so I doubt I’ll need one, but you never know.

Thanks,
George

Re: 1950 Chevy 6100 NAPCO 4X4
Napco Man #1352169 Sun Mar 29 2020 12:51 AM
Joined: Jan 2001
Posts: 1,561
ODSS President
GEORGE,

Old GIT - R - DONE, I remember her well!!!


Cosmo

"...my good horse Rozinante ('49 Chevy Half Ton), mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes

"If you come to a fork in the road, take it."...Yogi Berra
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