Siam,
I don't know what year or model your truck is, but if it has traction control youe least expensive mod is to do the CDL first. Without CDL yor 2 locking difs, no mater what you use, won't be as effective as they could be if you lock your t/case.
How much off road driving do you do, how hard a trail, and how often?
Mike J.
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