Hey, all!! I'm going to check out another ZJ for my wife to DD. It has a 4.0, 42RE, and NV-249. All with 229K miles.
My question is: If it's working properly, how long should it take the viscous coupling to engage the front axle when the rear axle spins?
I'm planning to run it through some snow to test it out and I was hoping to be armed with knowledge.
Any help is most definitely appreciated!!!!!
If it's working correctly, the transfer will be instantaneous. Not sure how you will test that, but I'm sure somebody will know.
What you need to test is the VC itself. To do that first get to operating temp (e.g. drive for 20 minutes or so). Then in a parking lot drive in figure 8's. If you can idle through the 8's your probably OK; if it binds, jumps, hops or you have to give it gas to push it through the 8's your VC is probably already done, or on the way out.
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...