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Just a point of detail, Quaife do still offer the lifetime warranty, they just exclude the US, Canada and Mexico. No idea why.

A couple of things based on 17 years and over 225+ track days with a 240 race car: Stock diff mount welded with two steel bars (17 years and no issues) Engine HP ranged from 150 to 350+ @rw Ran stock half shafts for 15 years with no issues Used any number of R180 diffs (3:90 Quaife/4:11 Quaife/4:38 OS Giken) Ran a 4:44 R190 LSD (stump puller) Swapped in an R200 3:90 w/Quaife using 300ZXT CVs w/Modern Motorsports stub axles The swap to the R200 was in response to toasting two R180s due to the 250rwhp/250#storque/10 inch wide rear R7 Hoosiers. One went after just 45 minutes at VIR on the R7s. During use in my street/track 240 and again in the race car, the bolts on the CVs have never, ever gotten loose and they are not wire tied. I use Nord washers and blue Lock-tite instead.