I have an 11' base/touring w/A7 & removed diff myself &'installed a Quaife ATB unit,,,Love it; basically plug & play...replaced bearings,seals,mounting bushings.
Got everything from Z1 Motorsports.
I removed rear oil-filled bushing from rear crossmember & replaced it too.
I reused factory 3.357 gearing & did not have to add any shims to either side; just installed everything in it's original place,,,torqued & checked tooth contact & backlash...perfect!
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