So, i bought these 1/2" longer ARP wheel studs to go with my 1/2" wheel spacers on the rear of car. I got them from LMR and they did not come with instructions. I was having some trouble getting them in so i thought i'd look and see what other people have experienced. I also measured the splined area on the new ones and old ones, and found that the new ones are .01" larger. WTF? When I sat and thought about it, I remembered people mentioning having to open up the holes. I found a thread with this post from Jack Hidley.
Don't install studs without drilling the axle or hub to the correct diameter. If you don't, you will ruin the hub or axle.
If you force the studs into the axle flange without drilling, they will end up on a 4.55" circle instead of a 4.50" circle. The metal in the flange of the axle is much less stiff on the outside of the stud hole due to the lack of material on the outside of the hole. When the stud is forced into the hole, the metal on the outside is going to move outwards due to its lack of stiffness. This allows the stud to move outwards also. This makes the bolt circle larger. If you carefully look at the axle flange from the hub face, you will see five bulges around the perimeter, one where each stud is located.
This may not seem like much of a problem, but when the lug nuts are tightened, each stud is now bent to allow the lug nut to contact the bottom of the counterbore in the wheel. If you try to install drag racing wheels with shouldered lug nuts, the lug nuts will bind up massively on the sides of the bore.
The thing is, I've got 3 completely installed, and 1 about half way before I stopped. Is my #$%& axle ruined?! What do i do now?! Obviously I'll open up the holes for the others, but what do i do about the ones that are already in?
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