The GMC CCKW

http://cgi.ebay.com/ebaymotors/1940-mil ... dZViewItem

Engine appears to be later model 270, with PCV, and note the oil fill pipe. 248 did not have this set up.
Note the GMC Trademark wheels with pointed hand holes. GMC was only truck to use these in 40s. Radiator Guard braces are intact.
Nice chance to have unique truck.

That would be a great addition to a collector of military 6x6 trucks. I hope it finds a good home and someone restores her properly.

Most people do not know this, but the cab is not the same as the CCKW.

The 1939-1940 civy cab had some differences that are very subtle that are not apparent from the outside, but boy if you went to put some parts into it from a CCKW or a Chevy....

I will tease you like Joel for a bit on this one

There were Civilian and GI versions of same GM Part Number Cab. Windshield hinges are one difference.
This truck has potential, but the original Cargo body is going to be a prob.

It is more basic than that:

Parts that will fit the CCKW or 41-46 civy cab will not fit the ACKWX or 39-40 cab. It is even worse if you are doing the civy as some basic cab parts will only fit one year!

OK what is wrong with this picture....?

I went and dug out one (I have 2) of my ACKWX-353 manuals and was looking at the xfer to see if it was a straight thru one like the AFKX-352 COE that uses the Chev 4 sp to get up to 48 mph. Notice the data plate on this one lists it as 45 mph and the tranny is NOT a 5 speed.

The manual lists an underdrive xfer like a CCKW and a 5 speed, both just like a CCKW. So what is this truck? The data plate lists only a 4 speed and the shift data plate matches. It is different from the Chev (45 mph vs the Chev 48 mph)

As Joel pointed out, it looks like a 270 or at least it has those parts on it. Could have been changed. It has the Chev 4 speed. Again could have been changed. I noticed though that it does have the pedal brace back towards the tranny that the CCKW has that the Chevy does not as there is no place to bolt it to. You cannot see from the pix if it is attached and if so to what.

The brakes are not the original which would have had the mechanical helper booster mounted in plain view outside the frame behind the cab. Again, something that could have been modified and probably was though there is no Hydrovac visible on the other side.

Now if it only had one headlight, I could see it as a British ordered truck having the 4 speed and all. They were quite thrifty (cheap) when ordering vehicles before the US got into WW2 and left as much off/out as possible and a 5 speed would not have been deemed necessary by out friends the brits!

Hmmmmm

I guess the only way to really settle this would be for you to buy it for $600 and spend $2.85 per mile to get it back to the POD. You could then keep us on top of your restoration progress.

This was definitely not the G-508 AFKWX which had the 5 Speed OD, but is definitely a 4 Speed from the GM factory. The Army did not standardize the 4 speed version, this must be from the developmental model ACKW. I tried Crismon's book, but he apparantly missed this model.
It will show up someday. It will take 20K to make this look nice, and maybe the CCKW LWB body will fit.

Bill: "Road trip...."?

Joel: It has a 162" WB so a CCKW body should fit fine

Did we notice 45 mph, 3000 rpms, 7.00 x 20 tires with a CCKW underdrive xfer?

Joel noticed the wheels. It also has 5 bolt non-Budd GM wheels

Wheels with Hand holes are still classified as "Budd" although they may be manufactured by Firestone, Motorwheel, Budd, etc, but the pointed Hand holes were a common GMC Civilian site. I never noticed, but all of the ACKW, and ACKW conventional Cabs used a 5 hole wheel I haven't got the time, but it pays to belong to MVPA as their army Motors have a separate index and aryicles can be referenced by author or topic. Issues 47 and 48 are by Bryce on "jimmys Ancestry" and show nice detailed pictures on the ACKW and ACKWX. One of them was a 4 Speed. The cab is reported as a GMC Model 984 which was made both as Civilian and GI with differences.
It pays to belong to MVPA as all the nice topics that newbies are curious about, have been touched upon by the most experienced experts, guys who were there to have experienced them.

The Truck is stiill desireable for it's historical significance, and hopefully someone has the bucks and resources to rescue it.

The 1938 GMC Model 4929 had the 4 speed, so that may have been an early production one.

OK The difference in the cabs is: Drum Roll.........

Open your hood and observe the cowl. Notice that the cowl is not flat. Once it starts down, it stops and protruded into the engine compartment about an inch and then continues on down again. The 1939-40 cab just goes straight down. What this does is make the toeboard different (shorter) and the side kickpanels smaller too. I believe that the floor panel is smaller too though I would have to check that (maybe this winter). By making this jut out into the engine compartment, it gave a little more leg room inside. It did not bother the engine compartment as there was no V8 to need that side room.

Now if you had the civy truck, it is worse: The crank out mechanism for the windshield, being different from the 41-46 is also different between the 39 and 40 models! One year for each one.

Little tidbits you pick up along the way from having these civy and mil trucks for almost 40 years

I do have one NOS GI Issue 700X20 US Royal Master Grip NDT with flap to get someone off on the right foot on this project., and here is a home for that 256 block that Mark M got hit with, it calls for a 248, but.........

The wheels use a hub center design I believe. They do not use Budd lug nuts and studs like the CCKW. They are very much like what are used today on some medium large trucks. Funny how things come full circle...

I guess what this whole discussion comes down to is the following....

How many of these trucks are left in the world in this condition? In any condition?

Does anyone know if there are any in collectors or museum hands?

Was this truck really used by the Military or not?

Anybody contact the seller direct to see if there are anymore dataplates not pictured?

Were these frame stamped with serial number this early in production?

Conclusion:

If this is a true Veteran... then except for the proverbial "truck in the crate"...this could be the "holy grail" of CCKW collecting.

From the bidders questions on the auction site it looks like a bunch of "Goobers" are interested in this! I hope a collector buys it and not Bubbas-Brother Daryl. It would look crappy covered in Astro-turf.

I have the TM-10 Parts list on this series of GMC's, but have no idea which stack of SNLs it is sandwhiched between. But I gotta try to make sense out of the wheel nuts after that one.

Idid check the CF-351 book, it uses the same wheels as ACKW trucks, and learned something new that is probly useless to many.

If I had a way to get it home ( ) I would probably bid on it.

Total Est. Time: 23 hours, 20 minutes
Total Est. Distance: 1416.74 miles

Ask your wife if she would like to go shopping to an out of state mall.

Who else but the military would develop the ACKW, it was classed as a G-508 in the system, but used a dedicated ACKWX TM Parts Manual.