Whenever I'm in 4 high I have a light whine, what could cause this? Front diff level good (Just changed), and the transfer case fluid is good (not overfilled). Maybe u-joint?

 

I would consider 4wd whine quite normal.

 

yeah pretty much normal. especially in older trucks, just all that extra stuff spinning. my old 80s trucks are kinda noisy, lets me know everything is working

 

Don't drive around in 4x4 on dry pavement. That stresses the hell out of the driveline and makes it noisier than usual.

Not saying the OP is doing this - just an FYI.

 

Usually on ice/snow covered roads, yes we already have ice and snow on our roads!

 

Why is driving it on dry pavement a problem?
I never understood that. You can drive on wet/snowy/icy/dirt road in 4wd but not dry. what is the problem with dry roads? how does it hurt the drivetrain?

I got the 4wd shift on the floor if it makes a difference.

 

It stresses the hell out of the driveline, mostly any time you make a turn. Even on flat ground there is a slight difference in rotational speed between the front and rear differentials. It's hard to tell, but its the same as standing on your brake and mashing the gas pedal to the floor for however long you operate it.

Find some dry pavement, put in 4x4, and try to turn sharp - that binding you feel is thousands of pounds of twisting force working against your front driveshaft, differential, & transfer case. Do it enough times and eventually something breaks. Absolutely no reason whatsoever to be running in 4x4 on dry pavement. That gets very expensive.

 

Thank you, my old 89 K1500 had something similar. In 2wd on the road would turn on a dime. put it in 4wd and it takes a mile to turn. Good analogy. never paid attention that close to it. Didn't think it would hurt it but now I know.


Thanks Again.