call chris at randy's ring and pinion in seattle washington at 1-866-631-0196, say that dave medley in spokane said to give you a smokin deal on a setup......www.ringpinion.com the 9.5" semi floating 14 bolt rear axle is a strong unit, they came 6 lug in the 7200gvw 1500 trucks and 8 lug in the 8600gvw 2500 and all hummer h2. the tubes can leak oil but some epoxy or silicone can fix that. the yukon gear brand has been extreamly good at installing easy and being quiet, you will need a shim kit when installing, the 9.5 has one shim on the left for backlash and a adjuster wheel on the right for preload. as for the g80,,, the 9.5 is so big the governer assembly cant hold the side gears from turning. they only lockup when slowly apling power (not when drag racing), pluss when it brakes it frekin' explodes taking every thing out with it.... want a ultra cool setup??? shhhh dont tell anybody but if you call around to the wrecking yards and get a eaton e-locker from a h2 hummer (any years, they all came with one) it is electric push button traction. open or locked up solid. aka...street or drag... they fit but you have to fab one retainer for the coil assembly, not hard at all. good luck...