Howling noise at all speeds are bearings or gears. So possibly pinion, possibly hub, possibly gears, I can't tell from here. It depends on the type of howl. Bearings sound like marbles in a can grinding on sand and gears can howl. Open up the front end and inspect it.
Did you run it without the front DS? My howling noise goes way with the front DS out. I guess it could be the TC front output bearing or a front diff part. With the DS out there is no stress on the front drive. I am going to swap in a np242 so I don't have to worry about it 99% of the time.
I have the all time 4 wheel drive though, dont wanna f up the t-case by removing the driveshaft...And ya i can do the swap, but dont really want to. I love the all time 4 wheel drive, and i only drive it during the cold months.... I really wish i could tell where my howling is coming from, it sounds like its super oud inside and is bouncing off everything in the cab..Impossible to figure out...I have a feeling its the front diff, because my old one howled from 30km-120km....But wasnt crazy loud..And i just put a junker one in and thought it fixed it, because it doesnt howl from 30-90km anymore...But once you get close to 100 km wow, i get this really loud howl, almost twice as loud as the original diff i had in there... I really wish someone would tell me it was my hubs or wheel bearing doing this noise....but really think its the gears
it really sucks i would live with it, but im on the highway 98% of the time doing the exact speed where it howls at.....cant have that its way too annoying..****ty part is I really dont want to change the axle again..and the money i spent on getting used front and rear diffs, i could have the front diff rebuilt
ya i suppose....i just wish i could tell which diff is making the noise, i almost think it might be the rear....tempted to put in my old rear end and see what happens. This could get ugly i could see myself swapping everything over and over and never fix the problem lol
My front diff whines - I did a temporary ahem "fix" by putting in SUPER thick lube and the anti-friction additive Mopar sell for LSDs in the rear. It shut it up for the time being, until I have time to swap out axles.