[jlex]

Had to replace both outer boots on my '88. My sister, the PO had it parked in her garage so long the rubber just dry rotted. When I jacked the car up, the rubber just split. Didn't do any driving after it split, so I just added a bit more grease when I replaced the boots (do inner and outer as long as the axle is off the car). You definitely want to take the axles off. Once on the bench, examine the joints to see if you have any contamination. That will answer your question as to whether or not to replace or just repack the joints.