if thats a 8.5" those will take ALOT of abuse too - they replaced the 12 bolt as the H/D rear end - maybe just upgrade to 30 spline axles and carrier maybe some billet caps , why not run it till/or of it breaks. The only poeple i have known to break them are running Big blocks with slicks and lots of nitrous(and thats in stock form) if thats not enough-someone makes bolt in Dana 60s that are near indestructible that are reasonably priced- under 2k thay have a 9.25" ring gear on them
