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I just put some of the redline synthetic lightweight shock proof oil in the diff of the ranger, , much lighter than the 90 140 in there, so first run today , it has a bit of moly in it and is blue, big favorite with racers so should hold up fine for you also, they claim 40% less friction and earlier test i did years ago showed a distinctl y noticable off idle boost from less friction so 130 miles run today , good luck with the truck and a question , How will you lower it? , mine is also twin ibeam and would like to drop 2 inches like you plan,
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