I have a 99 ( new style ) silverado 4x4. Early last fall, I noticed
the front end was really howling in 4wd. I took a look underneath and
noticed that the driver side axleshaft oil seal was leaking as well as
the pinion seal. I changed the axleshaft seal as well as the bearing.
When I drained the fluid, I noticed quite a bit of metal on the drain
plug. Right before X-mas, I also noticed the output shaft seal on the
transfer case was leaking. I had a shop change the pinion seal, TC
output shaft seal, as well as the u-joints in the front driveshaft.
Unfortunately, it didn't help the howl.
I read in another post that the side bearings have a tendancy to go
out in these differentials. I would like to keep this truck for at
least 2 more years/45,000 miles. It has 83,000 miles on it.
Anyone else go through this we these trucks? Whats the most
economical way to deal with this?