I have searched on this topic and found quite a bit of interesting info, but a question still remains. The usual test for the viscous coupling unit (VC) is to put transfer case in neutral, jack up one front corner and see if you can turn the wheel by hand (with some force). In the past, I could do this. The car now has 130,000 miles, and I can no longer move the wheel. Took it to the local Indy, and he has another test, which it passed. His test is to let the car idle while turning a tight circle; if it stops, you have a VC problem, if not all is OK. So, she passes one test but not the other. Anyone have any insight here? Should I just replace the VC considering the mileage? Some earlier posts seem to indicate that these things should go out around 100,000 miles.
Any comments appreciated.