ok, so i have a stock 2dr x with the dana 30 up front and would like to re gear to 4.88 , and would like an ox locker with the cable actuater and it asks 27 or 30 spline, im a noob to this kinda stuff so bear with me, do i have to buy new axle shafts with 27 or 30 spline? actually i dont even know how to post this friggin question...all i know is i wanna upgrade my front diff with gears and an ox locker with the cable since i gather it would be cheaper than air, i just dont know the process of upgrading...

 

I believe that the x and sahara come with a 30 spline and the rubicon comes with a 32 spline

 

front dana 30 = 27 spline
rubi front dana 44 = 30 spline

rear dana 44 = 30 spline
rubi rear dana 44 = 32 spline

 

The front in your X is a Dana 30 27 spline. The rear is a Dana 44 30 spline. the Dana 30 in the front is pretty strong as it is for mild wheeling. It's my experience that Dana 30s are quite durable when upgraded with performance parts.