I'm not sure if this answers your question but even with a bit of a lift in the rear ( I sit at about 22" hub to fender ) I felt the extended travel rears were a bit too much and most rigs would benefit from the standard length. Unless maybe your doing some extreme crawling and have big tires stuffed in there, that you don't want to rub, then I believe the standard rear length is the best bet.
As for the front, I think its suggested to just swap the rear set first and see how it feels.
Check out the OEM compared to the extended rears. Oh and remember, don't be an idiot like me and rush. Soak those old rusty bolts in the rear, crud in the frame has made them delicate. I snapped 3 of my 4 bolts before having to pay someone to repair and install my originals back on lol so I never did get the rears installed
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