I've put the Jeep in 4WD a few times this winter, with the storm we had last night I finally really got to try it out. The last few times I've put the transmission into the 4H position I've noticed that the 'part time' light does not illuminate. 4WD definitely engages despite the lack of a light. Is this indictive of some sort of problem, or could this just be something simple such as a sensor that is supposed to trigger the light?
When I'm crusing in 4WD I notice a bit more drive line noise, I assume this is normal? It's just more of a 'humming' sound is how I'd describe it.
Also, the manual doesn't explain much regarding 4H vs. 4L. As I understand it, 4L is really only for getting out of an extra slippery spot? I don't believe I'm supposed to cruise in it, correct? Does the L position somehow mechanically lock the wheels or something for the extra traction?
Also, the manual says that 4H can be engaged up to 55MPH... does that mean that 55MPH should be the max cruising speed in 4H even if it's engaged at a lower speed? I'm guessing if I need 4WD I probably shouldn't be going very fast anyway, but just curious.
Lastly, I've read a bit about 'wind up' in regards to using 4WD at the wrong times. I'm a big paranoid about damaging drive line components by having the vehicle in 4WD for too long when driving to work, even if the roads are a bit snowy/wet. Is it safe to use 4WD for wet roads, or should I really just reserve it for more slippery conditions like slush and snow?
Sorry for the numerous questions, but I'd hate to damage something needlessly. Thanks in advance.