Are you installing with an impact gun to get to the recommended 250 ft. lbs. torque? Some believe the ends are stressed by impact pounding and recommend using hand tools. I agree.
Reduce torque and use upgraded axle nut retainers.
The first was obviously stock AC, the second and third were OEM... 27/14/10 rear ... ITP Blackwater tires... I will try the torque suggestion. My new axle is a caiman? $100 on eBay with 1 yr warranty (that's what sold me)
Reasonable torque (100 ft lbs) and a set of these enhanced capture plates ...
But if your breaking CV joints I'm thinking "over articulation" -- do you have modified radius arms and if so, is the rear wheel alignment true. (At one time I had modified radius rods adjusted for some toe-out ... blew up some CV joints) Tire scuffing can heat up the CVs.
Some folks have tweaked/bent the upper trailing arm causing toe-in at the rear wheel (very easy to bend if you back up and bump something)
Also, the splined end of the axle needs to be greased...
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