In the last few thousand miles, I've been noticing some instability at speed or while cornering that has me worried. By instability, I mean like if I'm on the freeway doing 75 and I make a little swerve to avoid a bad spot in the road, the bike shows signs of wanting to enter into a wobble/oscillation - the same will happen in a corner if I have to make a line adjustment. The things that come to mind for me with what little mechanical knowledge I have are worn steering head bearings, swing arm bearings, and rear shock linkage bearings. With nearly 40k on her, would it be prudent to go nuts and just replace all the above? Besides needle bearings, do the "collars" that are shown in the parts fiches wear and need replacing too or should they be ok? What about the dust seals?