Before you buy:
1: vehicle off, put in drive with emergency brake on.
2: jack up RF wheel.
3: use torque wrench set to 90lbs. Try to turn the wheel (using wrench). If wrench clicks, viscous coupler is bad.
4: walk away if wrench clicks.
Otherwise it's a TC swap or VC replacement. Each is pricey in their own way.
Edit: source is Identifix and Chrysler service manual. This is how I found out my TC was bad.
Last edited by RTLee; 03-23-2013 at 06:12 PM.
Reason: Sources quoted...