68 GTX Rear Axle Bearing Help

i am new to this site. I have a 1935 Plymouth with a 68 GTX rear end in it. Neither I or any of my buddies are familiar with the Chrysler rear ends especially the preload adjustments on these. I want to pull the axles and have the bearings replaced. I have done this on my 67 Pontiac. Other then the preload adjustment is there anything else I need to worry about? Do I just loosen the plate bolts and pull it out. I thought I read that a plug or something could fall out. Any help would be appreciated. Thanks Mike