I am guessing you have a 2wd. If it's a front stud then you need to take the brake caliper off and remove the rotor. If it's rear then remove the drum and pound out the broken stud and install the new one. There is enough room to where you do not have to remove the axel in order to install the stud. I would replace all the studs since you will have it tore down anyway. Also a good time to do a brake job if needed
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