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You could get them at a truck shop or you could order the filter head on amazon and get the filter at a parts store

Yes this could very well be your problem. To verify get the air tanks filled up and shut the truck off and crawl underneath the truck and go listen to the air dryer I bet the purge valve is leaking.

Yes sir, here's the one on my m813a1 but it's the same as a m939 series truck.

That is insane!

They have it twice a year one in the spring and the other one is in the fall.

thanks rusty I will add this

The pricing varies depending on you location the filter is 38$ in my area.

I'm not sure if the a0's have the air dryer but if it does then yes they are the same unit.

Yes the spin on filter replaces the big canister filter on the frame rail in the drivers front wheel well. It fits in the factory holes that the canister fits in to. Makes the filter change cheaper and easier.

It's more then 50% it's at cost

No I'm sorry I ment march

Yes it was at the end of May the filters just came in this week. But for a full filter change it's 230$ normally but I ended up getting them for 60$ a truck with the sale.

Here is a quick, clear post on all the filters with pictures all in one post, I figured I would make one for you guys and hopefully it helps. ATTENTION ALL NEW M939a2 OWNERS: these are all the filters you SHOULD replace as soon as you get your truck! Especially the air dryer rebuild kit, even...