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Go to the auto parts store and borrow a nutcracker. Attach the nutcracker to the stuck nut. Tighten the nutcracker with a rachet wrench until the cracks completely in half. Now you can remove the wheel. Buy a new wheel stud and lug nut. Your lug nut will be pressed into a metal piece. Remove this piece and either 1) support the metal piece, put a good amount of penetrating oil on both sides of the bad lug nut and tap firmly with a large hammer. Let this sit for 5-10 minutes so that the oil can penetrate the stud. Now pound out the old lug nut with a large hammer. If it will not budge, then you can try heating the stud with a torch until it is quite hot and then hit the stud progressivly harder until it comes out. Now insert the new stud and pound it in until it stops moving. Last, before you reassemble, put the lug not on the new stud and tighten it real good to make sure that the stud is comletely seated. 2) the other option is to take the metal piece to the parts store and let them remove the stud and press a new stud for you.
No one here is really addressing your question. The rear studs are 36 mm while the front are 44 mm. He wants to know if he can use the rear ones because the longer ones won't slide in without grinding them. He's wondering if the 36 will be long enough to catch the lug nut sufficiently.
It is not recommended to drive it like that. It's not too bad to replace but it depends on your level of mechanical skill, You need to remove the brake caliper and disc and then you can simply knock the remains of the broken stud out with a hammer and punch, To fit the new one insert the stud and then put a large nut over the thread, then fit the lug nut and tighten it to pull the stud into the hub, then simply remove the lug nut and put it all back together.
Lug studs are pressed in from the back side and on most cars, if you rotate the axle to a specific point there is enough room to knock it out. then once you have the proper replacement, it can be "pulled" back in using a lug nut and washers as spacers. I have had lug nuts get ruined by this procedure so buy extras.
You will need a special tool to press the lug studs in and out of the flange, or you can follow these directions;
First you will have to pound the broken lug stud(s) out of the wheel hub/flange, use a punch or a drift that is a little smaller in diameter than the lug stud, and be sure that you do not pound on the flange itself, then you will need a lug nut and about a half an inch thick of flat washers.
1. Insert the new lug stud through the wheel hub from behind so that the threaded end is facing out towards you and then put some grease on the threads.
2. Then slip the flat washers onto the lug stud followed by the lug nut, and run the lug nut down backwards with the flat end of the lug nut towards the flat washers to take up the slack and use plenty of grease on the threads.
3. Then using a breaker bar tighten the lug nut until it pulls the lug stud through the wheel hub and it is flush with the wheel hub.
Be sure that the amount of flat washers used will make up for any non-threaded part of the lug stud that might stick out past the wheel hub preventing the lug nut from pulling the lug stud all the way through the wheel hub, and basically you do not want the lug nut to run out of threads before it can pull the lug stud flush with the wheel hub.
Let me know if you require any further assistance.
Only if there is an Acsess Hole Directly Behind the STUD'S PUNCH THE Broken SHORT one OUT But there May Not Be Enough ROOM FOR the NEW LONG STUD to go in between the HUB & Rotor Check this FIRST If you see GOOD CLEARANCE TO GET The new STUD in Then just Drive the old one out , and Use A LARGER than Stud Nut Or Washers to Pull New Stud Threw some Before Putting Wheel on. Then Put Wheel on And Tighten Wheel , Retorque after a Few Hundred Miles.
The lugs must be pounded out with a heavy mallet, the new ones can be put back in as much as possible, make sure they are straight, and then use your lug wrench to tighten on the lug nut and keep turning until the lug is fully seated.