My Jeep has got a tiny bit of whine coming from diffs, axles or whatever - I don't know what's causing it. The sound is constant from start to higher speeds, but not loud. If I put the radio on or turn the fan to step 2 it's almost not audible.
Between 90 and 100 km/h (around 60mph) there's a louder noise which comes when the car rolls without any tension on the driveline (when I let off the throttle). At first I thought it was coming from the roof rails - but it's not. This sound comes and goes, and it's not bad - only a touch annoying.
How can I set up my driveline so it's silent?
My Jeep is a '99 4.0 litre, has the Dana 30 in front and the 35c at the rear, 42RE transmission and Quadra Trac II transfer case. Transmission and transfer case is in good condition. Milage is 130.000 km/81.000miles, and the car is very well kept.
I don't get off road much, and if I do it's gravel roads - it's not legal to drive motorized vehicles outside of roads here in Norway unfortunately...
I am on a budget here, so changing as little as possible is an issue.
Any suggestions? I will most likely be buying the parts from the US, so links will be greatly accepted.
Follow up questions:
Are driveline parts interchangeable between all 99 - 04 WJ's??
Could a synchronisation of the diffs fix this? Does this require any changed parts (repair kit?)
Does later model WJ's suffer from the same problems?
Much appreciate any input on this - I have read a lot about these problems and talked to my mechanic (at the dealers), and I understand that this is mostly a problems for my ears, not so much the car. There's nothing saying my WJ will have problems running for a long time with this, but alas - I would like it to be quiet except for the engine sound which I love