Whenever I have done gears, my choice has been the OEM units. Yes, some/most are made from an outside source, but the quality control seems better when in a OEM factory box. Methinks GM makes the size gear your looking for. Be sure to change the crush sleeve/pinion seal and ask th eparts guy what additives go into the rear.
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Had-94,96,98,99 Cobra Stang,99 Navigator,03 Expy, 05 H2
Have-08 Titan C/C,06 GCSRT-425FTLB & AWD, other junk..
Want-08 Viper, 06 M5 
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