I replaced my vacuum switch (top of x-case) swapped front shift assy. (used one) and still had 4x4 issues. I suspected a vacuum leak so I siliconed all connections and it was OK for a while. When it started to act up again I heard a hissing noise under truck right after I shut it off. Once again vacuum leaks. The fix was to spend the measly $35. for a complete mopar vacuum harness. Learn from my 3 months of chasing problems and getting stuck!
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