Yeah, I doubt you would damage the bearings, just take your time and use lots of your favorite whizbang (ie PB Blaster). However, the bearings in the hub assemblies for the Dana 30 usually go bad with a stock set up around 100K miles anyway. I just had to replace my bearings (they were rather rough, and noisy), and in hind site, I should have done the u joints while I was there, I am sure mine are stock, it just didn't cross my mind until just now when you asked. LOL

Sean

99 XJ Sport 2 Door, 4.0L, 5 speed, all stock. Daily Driver
79 F150 Standard Cab Short Box, 400ci, NP435, NP205, 35" SSRs