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I have a 1970 mack powered m39 series truck. Im trying to find an air line diagram for the truck, im lost and someone hacked this thing out. Also need to know if this truck has a clutch brake and how to replace it... hard to put in gear and tries to pull when it does go in gear. Any help would...

Im having problems finding tie rod ends for drag link for M54,, i need some sort of schematic for air system that controls brakes and transfer case ( im lost on how it all functions and how it is activated)

What Engine ( bellhousings) will bolt up to my mack powered m54, i want either bigger engine or more gears to better use the power i have. So what engines will bolt up to my trans or trans to my motor. Any help would be appreciated

Would love to get help identifying this truck , its life started as a mack endt 673 powered dump truck other than that im kinda lost. Plan on bobbing the truck utilizing a triagulated 4 link and air bags. It will have 939 super singles and 14x20 tires! Im excited to learn more about the truck...