Pop your diffy cover and check your ring gear. There is a magnet on the cover. Check for metalic material. A bad pinion bearing will knock you ring gear outa whack and cause excessive wear. This will give the howl.
http://www.gmt400.com/forum/showthread.php?17277-REMOTE-OIL-FILTER-INSTALL-FOR-5-7-TBI&p=440557&viewfull=1#post440557
Summit should have one for the 6.5
Reread the first post and the first two pages. There are links to 97+ mods and posts affirming use on body lifts. I updated the original post to reflect the use of Grand Cherokee, Limited and Astro van shafts.