Transfer Case

[marlin4570]

I have the Rock-TracTM; NV241OR transfer case. It has just recently started making a noise like cards in bycicle spokes, coming from the output shaft area. I think it is possibly the output shaft bearing. Any ideas? and does anybody know if you can change this bearing or even get it out to look at it without pulling the transfer case out of the jeep? Thank for the help.