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Sorry I don't remember exactly, but it was less than a complete replacement.

I haven't had any problems since rebuilding mine; well worth the effort.

When I rebuilt mine I used electronics cleaner (in the spray can) and lots of long-reach Q-tips (as well as pipe cleaners), it's been working perfectly for well over a year now.

Spin on the top Spin-On Dessicant filter Cartridge finger-tight, then slide the air dryer housing into its mounting bracket on the truck. Snug up the 7/16" clamping nut/bolt with a deep-well socket, then insert & tighten the lower mounting bolt (use a 9/16" socket). Tighten the band clamp with...

USE THE SUPPLIED GREASE TO LUBRICATE ALL O-RINGS BEFORE INSTALLATION! I started reassembly with the Outlet Check Valve. Make sure the rubber side of the Seal Assembly is facing down towards the air dryer housing. I found it easier to hold the Outlet Check Valve assembly with the Seal Assembly...

Now let's remove the Turbo-Saver Valve assembly. Using a 1/4" socket and a very long extension, insert this into the long end as shown below...then use a large flat-tip screwdriver to hold the Turbo-Saver Valve assembly in place while you remove the 1/4" threaded screw (Screw, Thread Form). I...

Turn the air dryer housing over now. I mounted it in my vise, but used two soft 1x3 pine boards to protect the spin-on filter threads. On the air fitting side with the smallest air fittings, remove this assembly with a 1" wrench; this will access the Turbo-Saver Valve. Note the O-Ring on the...

This is how my air dryer looked after removing it from the truck. The spin-on dessicant filter on the top of the air dryer body was loosened in place, and once off the truck I removed the spin-on cartridge. I was surprised by the amount of crud & corrosion present, so just because a vehicle...

REMOVAL FROM TRUCK: Please make sure ALL air drain valves are opened to completely evacuate all air pressure from the system. As Floridianson stated above, it helps to loosen the spin-on dessicant filter before removing the air dryer from its mounting bracket. I also removed the bottom drain...

I recently rebuilt the air dryer on my M931A2; it underwent a total rebuild in 2005, but sat with little use until I picked her up in February, with 800 miles on the odometer. I used the upper (DQ6026) and lower (DQ6020) rebuild kits. The instructions included in the 6026 kit are pretty good...