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Message: <blockquote data-quote="stutaeng" data-source="post: 26841" data-attributes="member: 6175">As previously mentioned, any rear end will bolt up...GMT800, that is.On the 10 bolt, 6 lug: 99-04 were disc brakes, 05+ switched to drums. SUV were all rear disc, but the 1500 SUV have rear coil springs instead of leaf springs. 2500 Suburban and Avalanche did use leaf springs (but different lengths) with a variety of the 14 bolt rear axle.On the 14 bolt, 8 lug, you can get a 9.5" semifloat or the 10.5" full float, or even the 11.5" from the Duamax. Only problem is you would have 8 lug rear and 6 lug front. No easy way to convert the front to 8 lug. So maybe stick with 6 lug?Hope this helps.</blockquote>