lug patterns...
Butt-Head
Joined: Apr 2004
Posts: 9,455
Likes: 2,938
From: Reed Point, MT
It's not only a lug-spacing difference. The SD wheels are known as a "hub-centric" design where the center pilot supports the weight of the vehicle and centers the wheel for radial rotation. Older trucks (with the tapered seat lugnuts) use the lugnuts themselves (or a combination of the hub and lugnuts) to carry the vehicle weight/center the wheel. And no, the pilot holes are not the same diameter.
Since the lug nut holes in the SD are not tapered, standard lug nuts won't work. Besides, the thread pitch on the SD lug nuts is like M14x1 and are WAY more coarse threaded than the older trucks.
The BEST way to do this conversion is to take the wheels to a machine shop, have the existing holes enlarged and offset drilled to 6.5" c/c spacing, and then have steel tapered seats pressed into them.
ON EDIT:
Even if you do this, you'll still have to locate a tapered-seat lugnut that will allow the use
of the stock center caps that latch onto the stock SD lugnuts.
Since the lug nut holes in the SD are not tapered, standard lug nuts won't work. Besides, the thread pitch on the SD lug nuts is like M14x1 and are WAY more coarse threaded than the older trucks.
The BEST way to do this conversion is to take the wheels to a machine shop, have the existing holes enlarged and offset drilled to 6.5" c/c spacing, and then have steel tapered seats pressed into them.
ON EDIT:
Even if you do this, you'll still have to locate a tapered-seat lugnut that will allow the use
of the stock center caps that latch onto the stock SD lugnuts.
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Greg Dini
1999 - 2016 Super Duty
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Jan 16, 2010 04:45 PM
