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I think all the parts are available ,you would not need the whole kit because you already have air brakes.the parts list is on this thread.

Congratulations on getting though all the variables that this project threw at you.

I have installed my first outboard drum on the factory M931A1 brakes.Used the factory A1 studs and Webb 61577B Durabrake 14977 Automann 151.5703 or Gunite 3219ax drums ,hubs need to be machined to 5 thousands clearance in the area outside the bolt circle with the studs installed .the studs cause...

From everything I have read and my experience so far there is nothing wrong with wedge air brakes ,you just need to maintain them properly . Yes S cam brakes are easier to work with but an expensive change and so far not easily done in the front .In my opinion outboard drums will make working on...

I am working with Myothersanm1 on outboard drums for the S cam and wedge brakes as we speak , We will post our success or failure in the near future. We are working with M809/939A1 hubs the A2 drums are already outboard, and we are using easy to get modern commercial drums.

I think I have found drums that will work out board ,going to try in the next couple of months on my front first .will require machining down the out side diameter of the hub and the wheels will be spaced out 1/2 inch on each side