Could be whatever chart the shock place used to look up the 1"-2" longer shock is incorrect. I long ago gave up on what the applications sheets say and just measure for myself and order by p/n:

http://www.4crawler.com/4x4/Rancho.shtml

For the rear, I found the Rancho 5144 was about the longest stock you could stuff into the stock mounts and still have full compression to the bumpstops.

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