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Re: 2003 mach1 help!!
It sounds like you might as well just have the whole rear end rebuilt. The labor involved is almost as much as a gear change. So you need an 8.8 rebuild kit with axle bearing and a ring and pinion of your ratio choice. At 120k just do it right and make sure you don’t have to pay out in the near future for anything else in the rear end...
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03 Black beauty 5sp. MGW shifter, JLT ram air, intake spacer, MAC 3” catback, BBK o/r X, Bama tune
92 gt auto, hopefully turbo some day... 
2018 f150 sc, 3.5 eco, 10 sp., Guard green
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