You really only need a CV front shaft if you have a axle disconnect delete so the front shaft spins all the time. I ran one on my YJ for a few years and it worked well but the driveshaft angles were perfect for it and it ran smooth. You also need to replace the front yoke on the t-case with the proper CV yoke. I used a yoke off a XJ that had a CV front shaft. The CV yoke is a different length than the non CV yoke so you need to measure for a new shaft with the right yoke.
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