[travis29]

Yep works fine on my 2012 after i used the procal.

 

[travis29]

Better shifting, doesnt feel sluggish. Odo and mpg are more accurate.

 

[travis29]

I also input my gear ratio, day time running lamps option

 

[travis29]

Nope u can set it back to factory settings if u trade it in.

I wondered the same about 33s harming the rig, the only thing it harms is mpg's. Performance wise not sluggish after procal was used.

Once u get 35s and up thats when u need to worry about replacibg certain parts to prevent harming the jeep.