I want to say its either M8x1.25 but it may have been M8x1.5. I had to do one in my steering knuckle too. I bought the kit, as you need a special tap for it, and you'll have to buy the drill bit separately. The drill bit the kit called for was some really odd ball ??/64 bit, that I had to go to a hardware store to find, the auto parts place didn't have it.
95 YJ: SOA, locked 44, locked 8.8, 37s, beadlocks, OBA, winch, and a few other things. [URL=http://www.cdmfabrication.com/aboutmel.html]My Build-Up Post[/URL] -- [URL=http://www.cdmfabrication.com/kbl.html]SWB FAQ[/URL] -- Mike