Thats normal for it to make lots of sounds in 4 wheel drive. I would check your hubs just be on the safe side, BUT it is normal. The wheels are locked together in 4wd right?, so it makes sense when your turn that one wheel trying to spin faster than the other is going to agitate the other, thus the groaning and the occasional abs type feel on the inside tire.
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1994 Taurus SHO MTX
134k 3.0 DOHC 60 degree V6
Intake
plans:Eibach lowering springs (1'' front .5'' rear)
'96 Brake upgrade
KYB GR-2 struts
BBB (big bore butterflier)
Extrude honed intake
3.2 swap with balanced rotating assembly
stage one cams
full custom exhaust
BOOST
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