Al uses Moogs in his upper arms.
I bought a used stock upper arm from Mutt for a spare. I took the boot off to clean it out and put more grease in it and the old grease was gray, he said it only had 18k on it too.
Ive tried to get the boots off my arms thats already on the Jeep and I cannot. Ive gotten the rings off but Im worried that Im going to tear a boot so I just put the rings back on.
I believe the whole problem is the fact that water gets inside the boots. If there was an easier way to grease them then I believe they would be fine.
Found a pic..

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
Lost #007082
http://www.cardomain.com/id/jeepjeepster