Noticed a weird whine in the running gear the other day. Don't know what to think. Get's louder the faster you go, and whines whether it's in gear or not. Recently had the diff's checked and the oil changed. Anybody have any suggestions???

Are you driving an FJ40? Does it come from the rear end? <br><br>It could very well be a loose pinion nut in the rear differential. Undo the four bolts that hold the rear drive shaft to the rear diff (rather, remove three, and let the 4th act as a pivot point to swing the drive shaft down & out of the way) so you can inside the diff. I put a DROP of LokTite on the fringe & pinion arm then sinch the nut up so it won't come loose again. <br><br>A friend of mine had a '74 for about 10 years, and every year he'd be digging into the rear diff to tighten that nut.<br><br>The thing with LokTite - make sure you're ready to commit to tightening that nut down because the only way I know of to break that seal is with heat.<br><br>If you don't tighten that nut, it could wind up bouncing about in there and tearing up the bearings & seals.<br><br>Good luck, & happy holidays.<br><br>Peace,<br>Jake

its probably your transfer case is low on oil<br>it happened to me recently it will make this noise weather your in gear or not.don't wait or damage will occure! <br><br>Jim M.<br>77' fj40

coming up on a year since your prob surfaced... what did it turn out to be? Mine did the same thing recently, and even tho it left no "puddles", it was low fluid in the transfer case. go figger...