XC90 speed vibration

I've been procrastinating a fix for a vibration that is speed related on my xc90. It starts around 45mph and comes and goes up to 65 or 70... I broke some stuff 'diagnosing' it, and once I fix that I'm going to take the awd driveshaft out. I'm assuming a bearing is bad, any ideas? I want to repair the driveshaft because it's really expensive to replace.