riding home today, i heard a noise i had not heard before, bike is 92 r100gs just under 30k miles, in good shape. in gears 2 or higher, i get a sort of whirring/gear lash/bad bearing noise while in decell, or while riding, but not under throttle. I've only had this bike about 200 miles. As far as i know, the circlip has not been done. i got the bike home, and put on center stand, and ran in gear, makes a whole bunch of racket and i can feel it in the trans case (ive searched since i came on here tonite and found that they make some noise in this situation) i do not get any noise rolling in neutral backwards that would lead me to think drive shaft, and i have minimal play back and forth at final drive while in gear, and i can feel the "slop" as being internal to the trans and not the forward u joint. what do you guys think, first step, pull back boots, look at drive shaft, or just dive the fuck in, and get the trans to an expert? im a mechanic for a living, so i ain't scared, but i do not do transmission internals. and would just assume have someone that knows what they're doing take care of it once.