It probably wasn't engaged. You have to have the transmission in neutral in order to switch into low range.

 

100% it wasn't engaged. You can't miss the higher RPM if it was engaged!

 

This.

if you flip the knob to 4 low, you get a little message that you have to be in neutral.... if you flip it and back while driving nothing happens ..

 

You can't exceed about 25 in 4 low. Plus on the highway in 4 low you would have bound the drivetrain up so bad... Yikes.

 

Like every one said . Dodge basically made our low gear idiot friend proof

 

I went out and played with the 4low when I first got the truck. Went out to a dirt lot, got it in 4low and slid it around. Well worth your time for two reasons.... 1) you get a better idea of how the system works, and how it feels, and 2) sliding an AWD truck around on limited traction surfaces is FUN!

 

I first used mine in a blizzard, and ended up driving through my girlfriends ditch... And 3ft of snow. So yes, it's very very fun! And it is actually quite powerful on factory goodyears, didn't slow at all!

 

Awesome! Thanks guys. I feel much better.

 

I think if it weren't for that plastic lip on the front that simply destroys any useful approach angle (and that I am constantly worried about tearing off on some curb or something...) that the AWD version would fair fairly well as a stand in for a "real" off road vehicle. For as many parts as it shares with the JGC, I think it ought to.