If its stock or lifted about 2" or so you can get away with no SYE. I have installed several F8.8s into TJs with no sye. Didnt have any issues or terrable driveline vibes. Once you get to 3"+ lift you really need to look into getting a SYE because of angles and vibes. The U joint flange for the pinion can be had from a driveline shop for around $20ish or so new.
AARON
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91 MJ Under construction
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