Chris,
A new (used) rear end would be the easiest and cheapest to do but won't 
guarantee you get a good one.  Since you have to pull it anyway, the amount of 
work 
may be close to what you would be into in the repair job.
When replacing the pinion bearing, the entire gear set will need to be reset. 
 This takes an expert.  Several disassemblies of the set to get the right 
backlash and preload in the ring gear.  If you pull the rear end and break it 
down, you are looking at posibly $200.00 plus parts to reset the pumpkin guts.  
(my opinion only)
Paul
Colorado
 
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