should have 4:10/11's front and rear, if you have a 4wd, you must do both, are you talking the complete assemblies? If you are swapping completes, here are a few things you may need:
gear lube,
rtv silicone (for the diff covers)
ball joints
unit bearings
rear brakes
front axle u-joints
upper control arm bushings (axle end)
new u-bolts
possibly brake lines
I'm probably missing something.
Oh yeah,make sure they are in fact the same ratio front and rear, my wrecker bought me a new transfer case and I paid the difference to upgrade to a lsd 8.8 ford rear. The transfer case made a pretty neat sound!, and it sure skidded good on the wet road