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Well that was a bust.. my tuner called and said the axles were so noisy on th dyno, he thought they were gonna blow.
So I picked up some junkyard axles and swapped them until I could open and find out what was up.
I got em open last weekend and these axles are toast. All the wear surfaces are pitted and galled. They weren't going to blow up on the dyno, but they were definitely done.
Don't know how much track time was on them, but they were cryo treated by previous owner and packed with some *really* thick grease. Maybe that lengthened their lifespan, but theyre done either way. No part lasts forever!
I'm currently swapping the rear to a 4.3 from a 2017 and have some of the PBM diff riser bushings on the way. Will rebuild the junkyard axles w/ redline CV2 while its all apart and see how long they last me.
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