Re: Pinion bearings. What bore size?!
Right, the inner bearing is an interference fit. It won't just slip on, also there has to be the correct size shim underneath that bearing. The outer one should slip right on though.
Are sure you're up for this dude? A rear end is one of the more difficult things to rebuild. Do you have a press, a dial indicator, a micrometer or calipers, a beam type inch pound torque wrench and marking paint? Do you have all the specs? You'll need a manual to get those. If you don't, you need them first, all of them.
Next time just buy a kit. It will have all the bearings and shim packs and everything else you need to rebuild. Still need the specs though.
Ps...Im pretty frickin awesome!