Quote:
Originally Posted by 83GMCK2500
No one's mentioned it yet, so I'll just throw it out there, that lip is for maintaining hub centricity between the hub and the duals. It is (naturally) larger on a DRW hub as it needs to center two wheels as opposed to one. GM hub bore for those wheels should be 4.56" if I remember correctly. An adapter or spacer with that ID shouldn't have any interference issues.
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The adapters are designed for and fit perfect on DRW 14 bolt hubs, the issue is with the 3/4 or 1 ton SRW hubs. I have never tried to fit my OEM dual wheels on the SRW hubs but I would guess if they are hub-centric they would also have issues with that lip.
75Dually is running a 3/4 ton rear axle.