Talk to my mate who smashed multiple GT toploaders behind his 350 in a HK GTS before putting the Muncie back in that he originally removed to save it from the same fate! Muncie is back out now and doing daily work in a WB tonner after 11+ years of abuse. Toploaders lasted on average about 6 weeks! To be fair to the Toploaders though, they were probably never designed for that sort of caning. The same car busted many 9" LSD's before a mini spool was installed which fixed that problem.