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Re: 75 Dually build
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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Devin
1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt
1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050
1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350
My Introduction with my '83s History
New Daily, the '96
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