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I have a '71-'74 (8-lug) Dana 70 under my '65 F-350 dually. I think (but will check before ordering anything) that I once replaced the left side studs with right-hand thread parts.
The rims I bought new some years ago, and they each have four coined holes and four flat holes! So am I supposed to be running flat (washer)-faced lug nuts on all eight studs, or four of each? I know I'm not supposed to use the tapered nuts on the flat holes (although I have never had one loosen).
Can anyone help me straighten out my nuts?
Not sure what "coined " holes are, but if the rim has some flats, and some made for a tapered nut it would be odd, or for a reason.
Are the wheels hub piloted, or centered off the tapered nuts? If hub piloted, you could use all flat nuts, ignore the taper holes, pick a nut size that matches your rear nut wrench size and be done. If not hub piloted, I would drill a counter sink to match the others and have 8 nuts the same
The flat nuts are only for hub-centric wheels. All our old trucks are lug-centric, hence the tapered/conical nuts.
What I can't figure out is whether to put the nuts on the flat holes upside down (flat side to the wheel) to improve the contact area. The four "innie" holes will center the wheel on their studs either way.
Because I don't feel like dismounting a pair of heavy truck tires/wheels just to take pics
But here's what it looks like with everything bolted together. Notice that the nuts that enter the tapered holes will thread on further.
If I added those reinforcing flanges, four of the eight nuts would still sit higher because those four flat holes wouldn't accept the coining but the other four coined holes would... and it would introduce a new stress by flexing/bending that flange in four places.
The flanges sit flat face to the wheel and actually spread the load to the entire face of the wheel. I've worked several short buses with those wheels. Personally I didn't like the design but I just did the tire replacements. And maybe you have something totally different. If they are something odd I'd like to learn more about them... Never seen any truck with four coined lugs and four washered flat faced lugs.
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Need help with my (lug) nuts
