how much does a general rebuild for an 8.8" rear axle cost?? my rearend is leaking out the front of the pumpkin at the pinion bearing, and clunks like crazy even at low speeeds. all i have to do is let off the gas a little bit and it clunks, the tranny is shaking as a result of this too. i've heard the noise for a while now but didn't think it was major, but now it's noticeably leaking on the ground, needless to say i've stopped driving it. what would my best action be here, full rebuild, or could i get away with just doing the pinion bearing or what???