Hello All, I was hoping to get some advise/suggestions on which direction I should go as far as replacing my R100GS/PD drive shaft. The bike has approx. 88K on the clock, as far as I can tell its not the original (un-updated) drive shaft, changed at least once. It went out on Saturday while going down the freeway heading to a planned Dual Sport adventure south of Blythe, CA. Haven't torn into it yet, but when I peeled back the rear rubber boot on the shaft housing, pieces of needle bearings and housing fell out and it "clunks" when wheel is turned. My question is, should I replace the drive shaft with a stock BMW one or look to the serviceable aftermarket ones with Grease Zerks. I run the bike hard in the desert with full knobbies, trying to keep up with my buddy on his R80G/S, so the more robust the replacement shaft is, the better. If the aftermarket shafts are the way to go, please provide product name/purchase info. Also, is there any other service recommendations I should perform to the final drive while I have everything apart. Thanks very much in advance. Troy.