93 gm4 howls at 80 km/h

What speeds, does it make more noise in 4 wheel drive or the same. There are several possibilities, need more information. Does it howl in all the gears or in 5th gear only.

run diagnostic, check your wheel brg and rotor plate might hav cv grease on it also clean all sensors with brake cleaner

with the wheel bearings failure , it is very possible that the "U" joint or cv joints for the front drive were damaged
I would be looking in that area especially as you mention on turning right

If your ABS runs thru clean upon initial starting of the car and only turns on when the car has been put into motion,
You have a vibration occuring near the wheel speed sensors that is tripping the ABS system up.
Is there any howling noise while driving down the road ( like the howl the tires on a truck would make , but more subdued), and it goes away when you are driving down the road and turn one way or the other?

you didn't say what kind of truck it was but that sounds like it could be a carrier bearing or a bad drive shaft, if the drive shaft has ANY dents or dings it won't be balanced.

Probably rear brakes. Clean them up or get them looked at and try again.

maybe a wheel bearing if you are driving and cut the wheel one way the noise should increase cut the wheel the other way noise should go away

Try jacking your vehicle up and turning the tires. listen for any odd noise like a grinding sound, wheels hubs have been known to make a grinding noise when they go bad.

as stated above, check the transfer case fluid level, also check the fluid in the front and rear differentials, make sure it is full and clean. if the howling still exists it can also be caused by hub bearings, or differential bearings.

definately sounds like wheel bearings