It depends on what truck. It could be a very easy replacement. If it's a camber or tow link it may be 5 minutes. But it depends on that modem you have. The staff is great to work with and always more then happy to give you pointers and tips. If you work on it there and you run into a problem they can steer you in the right direction
If you want the guys at Larry's to fix it, it's like $25 a day and hold time is around a week cause they are so busy. My recommendation is to go there and they will help you with what you need and do the work yourself.
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