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Subaru 6 Stud Conversion
Written by Thomas Paine - Phizinza
Old Subaru's have always had a problem with what wheels you can fit to them. Because most cars use 4x100 Stud pattern and most 4x4's use 6x139.7 Stud pattern it makes fitting any good wheels to the subie's 4x140 Stud pattern difficult. Unless you have plenty of money to burn on some custom mags.
Here is a basic step by step guide to Drilling your hubs and making them the better 6x139.7mm pattern. Enjoy.
Drilling the hubs
First off you need the following parts.
You will start with something like this. It is a front hub from a 82' EA81 Wagon. Still in it's 4x140 glory.
Now you need the six stud wheel. With the two remaining studs in your Subaru's hub bolt it to the 6 stud wheel like you would if it was on a car.
Line the punch up as close as you can get it to the center of the hole in the wheel, Tip: try looking at it from other angles to see if it really is centered.
Now that you have the 4 new holes drilled to 14mm grab your Angle grinder and flatten the back of the hub where the new stud will go. This is to make the stud sit in place without rocking around (which causes wear and may lead to the stud splines failing.)
Extra tips and tricks:
You can also use a punch that is smaller then the threaded end of your stud to get your studs out if you plan to use them again. This avoids burring the end of the thread.
When drilling the hubs, weather you use a drill press or power drill, keep the drill bit point well lubricated. RP7, WD40, Machine oil, or just engine oil does a good job. When the hub or drill bit gets hot back away and cool it down, water is on for this. If the drill bit gets to hot it will blunten faster then usual. When this happens you will need to sharpen the bit or get a new one. You can use a drill bit sharpener or you can sharpen it yourself on a bench grinder. Although it takes practice and persistence when sharpening this way.
Some people say you need to weld up the old stud holes to make the hub strong. This is a stupid thing to do, and I would highly NOT recommend this. When you weld you heat up the metal, this changes the structural strength of the metal and weakens it. When I welded the studs in I didn't try to completely weld the top of the studs to the hub, I just put a bit of weld on the surface to hold the stud from coming lose while I was trying to get the lug nut off.
Here are some extra pictures to give you a better idea on what was done. And how it ended up.
So, that's it. I hope you can follow this. If not, send me an email, and I'll see if I can help.
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