i have installed a 2,5 tf coil lift with shocks, front track bar and steering shock stab.
My Jk is a 2dr with serial front bumper (plastic), also i don´t have a winch, so my lift is now about 4", i have read something about this amount of height will cause damage to the drive shafts, especially in the front one.
Should i replace this one?, in that case which parts will i need?

 

you should be fine. thats the lift im running on my 2dr and i have stock drive shafts.
looks like you have some rake, maybe the rears will settle some.

 

being that you have a 6-speed, you should be fine with the factory shafts.

 

wich one would be first, front or rear?, i supose front, isn´t it

 

Depending if you are an auto or a stick. If your an auto then you should do the front first, if your a stick do the back first. I am an auto with 2.5 bb with 3/4" spacers in the front and have gone through 2 stock driveshafts. I am now running a coast driveshaft with yokes. Remember that if you do this you will need adjustable control arms to set your caster so you don't get any vibrations.

 

being that you have a 6-speed, you will not need to change out the front. the rear will be at a steeper angle and this will cause it to go out eventually but, not for a while. i would replace it when you need to which may be as long as a year or so.

 

ok, then i would need to change rear drive shaft first, and later the front one, and in this case i would need adjustable front arms to set the caster. is it all right?
shit... then i must say goodbye to the winch and front bumper because of my wife could cut off my head,

 

you shouldn't need to set your caster with the little amount of lift that you have and again, you may find that you can go a long way with your factory rear shaft.

 

Ok, I'm confused now. A 4" lift won't have the caster just a bit too low?

Since the OP may not need driveshafts, CA's may not be needed for that. However, at 4 inches of lift, a set of front CA's may be a very good call for the low caster, correct?

 

ok, this is why i didn´t think to use adjustable arms. I´ll wait to change those drive shafts.
Thanks so much