Quote:
Originally posted by grnSVX96
I did the static 'standing height' front to back tonite on the staggered wheels the backs do stand 0.25inches [~ 6mm] higher than the fronts ...allowable tread wear variance on tyres is around 8mm..I'm aware as per threads elsewhere here that AWDs are fussy with air pressures and tyre tread wear but 1.02% variance in size [0.25"/24.5" x %]
More ideas on why the AWD system would cause the thumping sensation ..assuming DIFF LOCK test has identified this as the culprit.
David 
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It's the difference in your tires.....
1/4" difference in height on a tire that is about 24" diameter compared to a 24 1/4" diameter is converts to a rolling difference of 75 3/8" compared to 76 3/16 or 13/16" difference...Subaru specs less than a 1/4" "Rolling" difference, not standing height difference, so your tires are what destroyed your planetaries....
My thoughts on it....not that they're worth much
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Huck
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