just loose splines, it's just old and worn. i wouldn't worry about it since it isn't driving your truck. if it was a rear, might be different.

you are speaking chinese buddyDitto, you also might want to check to ensure that the dshaft has sufficient travel on compression - looks close to me.
Please elaborate
mine is worse then that. but it isn't the main driveshaft is all i am saying. i don't imagine you're doing 50+ in 4wd.
as for now no, maybe 25 or so up to the sites