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With out a double check valve if you pull down on the lever you would put air to the trailer and the truck brakes I think because the brakes on your truck can be applied when using the glad hands on the front of the truck when towing . On the hand brake lever you have a supply line in and a...

I think you need a double check valve ? one from a m52A2 may work .I added one when I made a m211 in to a tractor .

You might need new window channel in the doors . Memphis Equipment has a kit .

One piece housing banjo type - Hypoid ,single reduction . Ratio 6.17 to 1 full floating axles

Memphis Equipment has them you can check Ebay. It's almost 700 pages of pictures and information .

The GMC can be difficult to repower with the high and low range in the transmission the transfer case is singal speed and the front axle is reverse rotation .

In the 80's when searching for a oil pan for a Cummins I was surprised at the country's that made parts . If I remember right add Spain and Australia to the list.

I drove DM Mack with 237 horse power engine .I changed the shutters from auto to manual and could keep the engine at 210 degrees it pulled much better.

This is what happens when the cords come apart some times the tire will form what looks like a rib sometimes it can just let go .This can happen in old or new tire that is aired up .

There is some good information if you do a search . I put each wiper on its own supply line and valve. Larger trucks had air wipers for a long time and seals get dry. You make a simple filter out of a 3/8 pipe collar with rope fiber in side to keep crud out.

Try Steel Rubber Products . They can send you a catalog you will have to measure your window and length .

I have a NOS heater kit in the box that fits a m151 jeep I put one in my m211 you will have to make brackets and make adapters for the defrost on this heater they are 2 inch . Pm if interested.

That's the same valve I have on both my trailers 1954 m269 and 1967 m131a5c. I think c-6 or r-6 relay valve .

When hooking up to new to me trailers I have hooked up the lines the wrong way and had to unhook drain the air tanks on the trailer completely to reset the valve .then try again .

A running Mack endt 673 take out may be better then just replacing the crank they are some times on E bay. Your truck has every thing to swap it in. As what it's worth I paid $350 for a Mack bell housing a Mack water pump core is $100 a rebuilt water pump is $300 the water manifold and oil...

I can not think of any thing unless you added a power take off and it needs more shims .

I used a air hammer I bought from Lowes for about $25 dollars . It vibrates and there is no damage.

My first m211 transfer case would not shift in to six wheel drive in reverse . The mechanical adjustment needed more travel then what it had . You might jack up one front wheel and unhook the shaft on the transfer case and push or pull the shaft in or out it is spring loaded . The adjustment is...

The L shaped angles on the out side of the frame look correct for the cckw spring are 2 inch wide with center at 27 inches . m211 springs are 2 1/2 wide at 32 inch centers . didn't some CCKW trucks have the M-211 looking axles? interesting find .

What is behind the side window on the cckw ?