My 1997 T100 4x4 just started making a grinding noise that sounds like its coming from below the bed right behind the cab. It's worst when around 45mph in 4th I let off the gas, it sounds like a loose grinding sound, kind of high pitched.

I was reading something about the carrier bearing in between the driveshafts, would that be making the noise? How do you check that without a lift (or a garage, with 8" of snow on the ground)?

Thanks