hum or howl in 4wd

[Doubeleive]

this has been a historical issue on the gmt800's some of the front diff''s are just noisy period..
I experienced the same (noise in 4wd) and there was no indication of anything being bad, miles and miles and miles, always worked fine, just noisy when engaged
no metal shavings, no leaked out fluid, no play in anything, just noisy.
have not really heard of it happening on the 900's though until now.

 

[Charlie207]

this has been a historical issue on the gmt800's some of the front diff''s are just noisy period..
I experienced the same (noise in 4wd) and there was no indication of anything being bad, miles and miles and miles, always worked fine, just noisy when engaged
no metal shavings, no leaked out fluid, no play in anything, just noisy.
have not really heard of it happening on the 900's though until now.

I would have been fine with the noise in my front diff, but it was getting worse and worse, and the fluid was clearly full of bearing material - lots of sparkles accumulating after fluid replacement and almost no 4WD engagement.

I have the bad unit sitting on my workbench, and I'm not sure what to do with it. I could probably pull it most of the way apart, but I don't have a press to reassemble, or the desire currently to fire the parts-cannon at it.