Quick non-mopar question...

Some had a selector most do not.
Only time you know 4wd isnt working is when you get stuck.most of them are controlled by the ecu detecting slippage and applying the front awd clutch in t-case.
Got my son's going today,gutted two diffs,assembled one. He did most of the work himself,while i coached him. He feels smarter now.I,however still have a sore back. Darn weather changed dramatically. Gets me every time.