Wait are you saying the 5x5.5 makes the front wider, but the 5x5.4 doesn't?I also have the Yukon 5x5.5 manual hub conversion. I chose it over the Yukon 5x4.5 manual hub conversion kit for three reasons: 1) Bigger and stronger than the Ford style 5x4.5 hubs (although @mrblaine observed that in practice hub strength of the 5x4.5 kit isn't much of an issue); 2) I didn't like the idea of the 5x4.5 kit widening the front track 1.5" with no good way to match the rear track (although @mrblaine informed me that he actually prefers to set up jeeps that way rather than equal track front and rear); but most importantly (3) I was able to get a killer price on the 5x5.5 kit from Amazon that was $650 off retail and $400 less than the 5x4.5 kit. In the end I had to purchase $525 worth of new wheels with the 5x5.5 lug pattern, offset by the $400 I received for my old wheels, and it cost $75 to remount and re-balance my existing tires, so I really only saved $200 over the 5x4.5 kit.
Do I regret my choice to go with the 5x5.5 kit rather than the 5x4.5 kit? Absolutely not.
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Because I have a 8.8 in the rear, and it is already a 1/2 inch narrower.