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3.) The only driveline shock absorber in the entire drivetrain is the bonded rubber coupling in the driveshaft. This is not a particularly subtle or forgiving set up so ride sympathetically.
As for the movement in the front yoke of the driveshaft? Is there any debris inside the boot? If not you are probably fine. If there is debris then you have a problem.
As it is removing the Swingarm is a very good idea anyway as the swingarm bearings are rarely greased well from the factory so it's worth re-packing them along with the suspension linkage bearings. Be careful with these though as the needle rollers are crowded not caged and will fall out when you push the inner races out if you are not super-careful.
Are You talking about that?https://www.youtube.com/watch?v=V4Pj8IfkyJsI've already ordered new suspension linkage plus two bearings and sealing for the forged arm. Previews owner was driving in a bad weather conditions quite frequently without appropriate preparation.
Butting in here...when I took my swingarm off the bike to check the bearings I was surprised with how hard it was to get the drive shaft free from the transmission output shaft. Hell, it was a simple splined shaft...WRONG. As Pete has said, there is internal clip on the drive shaft that engages a groove on the output shaft. Here's a photo of the output shaft and that groove.Note the groove in the splined output shaft.It takes a right smart smack from a dead blow hammer to break the driveshaft free. Then it's easy to take care of anything else you have on your mind.
I read about that groove and clip in leafman60's description, and implied in Pete's description, and .... and ... is it REALLY OK (and as designed?) to just smack the clip off the groove? That's not how most C-clips and E-clips work in a groove on a shaft .... ?
And all of those problems and misunderstandings have the same cause. Crappy workshop manual. Probably no other motorcycle brand have that ridiculously poor service manual. This in not a workshop manual. This suppose to be a user manual :D.I'm glad that we have this forum. In my country I have only one importer and two repair shops. After all there is around 15 Stelvios in hole country. ;D