I just did my front diff bearings (04.5 400) I installed All balls bearings. I also had to replace the output hubs, they were pretty rusty and sloppy. I also replaced the bearing on the pinion with all new seals. I put every thing back together which went well. Once bolted down, it was quite hard to turn the pinion, I had to use a screw driver on the shaft to turn it. I loosened off the bolts and it was quite a bit better but still clunky and stiff. I used a Clymer manual which was kind of useless because it didn't have the exact diff. It was pretty straight forward though. One big washer and the smaller black one that fit into the roller cage. I didn't mic the bearing width of the new ones thinking they'd be fine. hmmm Any suggestions fellas?