I want to lift my truck but i hear a 3" body kit stretches the brake lines too much. Anyone hear anything about this? or have any problems?

Usually a good name brand kit will have all components necessary to complete the job, I know my suspension kit had brake line extensions with it. If it doesn't have it, inquire before purchasing, you may very well not need it. I know with the body lifts I have had previously, the only thing I can remember having (and it came with it) was steering extension.

Yeah thats all they say they come with. The place i want to buy the body lift said that he inquired and everyone says that a suspension lift is the only way to do on a dodge, but then thats a least an extra $1100 to buy that.

Read the post I made yesterday about the +'s and -'s of the different ways to lift your truck, might help you make a decision.
https://dodgeforum.com/m_998128/tm.htm

Yeah that helped. I just ordered a 3" body lift today and ill see how that goes.