[FONT=Arial, Helvetica, sans-serif]A note on studs:[/FONT]
[FONT=Arial, Helvetica, sans-serif]Basically when they list studs, they list the thread and pitch of the studs (i.e.: 9/16-18 or whatever), the length of the stud (which is the length of[/FONT]
[FONT=Arial, Helvetica, sans-serif]the part the lug nuts thread on to), and diameter of the 'knurl', which is the splined part of the stud, and often the length of the knurl (called the[/FONT]
[FONT=Arial, Helvetica, sans-serif]shoulder length).[/FONT]
[FONT=Arial, Helvetica, sans-serif]Dorman part # 610 - 283 is the part number for the STANDARD 1 ton Chevy, it fits 77-91 Chevy trucks. 9/16-18 thread, 2 17/32[/FONT]
[FONT=Arial, Helvetica, sans-serif]long, .650 shoulder, 15/16 shoulder length.[/FONT]
[FONT=Arial, Helvetica, sans-serif]Dorman part # 610 - 303 - fits 77-91 Chevy trucks. 9/16-18 thread, 3 inches long, .678 shoulder, 15/16 shoulder length. It is[/FONT]
[FONT=Arial, Helvetica, sans-serif]identical in most measurements (including thread) to the 610-283, except that it is somewhat longer and has a knurl of .678. In actuality, the ones I measured never mic'd to more than .672.[/FONT]
[FONT=Arial, Helvetica, sans-serif]My friend Chad who did a DRW-SRW conversion reports:[/FONT]
[FONT=Arial, Helvetica, sans-serif]"If you find that even Dorman 303 is too small, Bicknell Racing Products sells a wheel stud, part number BRP2059, which is 5/8 Course thread, 2.75[/FONT]
[FONT=Arial, Helvetica, sans-serif]inches long, .685 shoulder with a .800 shoulder length. This stud was meant to be used in a hole drilled out to 43/64, which is the exact size of the[/FONT]
[FONT=Arial, Helvetica, sans-serif]hole I used, so this is the stud I ended up using, and I can report that it fits quite nicely into a 43/64 hole. They also sell another wheel stud,[/FONT]
[FONT=Arial, Helvetica, sans-serif]BRP2075, which is exactly the same, but 3.75 inches long. The shorter stud worked fine in my application, but some people may want more stud sticking[/FONT]
[FONT=Arial, Helvetica, sans-serif]out. BRP2051 is the lug nut that matches, but I think any 5/8 course lug nut would work fine."[/FONT]
[FONT=Arial, Helvetica, sans-serif]The important thing here is to select the studs you need to use FIRST, measure the knurl diameter carefully (mic it) and then have the holes drilled slightly undersize for a proper tight interference fit. Standard class V interference fit (tight - semi-perm. assembly) the interference (shaft bigger than hole) should be between 3 and 18 thou. Given this, and the fact that the measurement of the knurl will be the major diameter of the splines, I would shoot for a 15 thou undersize hole. Given the measured knurl size of .672, this would mean a hole diameter of .657. A 21/32 drill bit is .656250, yielding an interference fit of 15.7 thou. That should be just about perfect, but MEASURE TWICE, drill once![/FONT]