slipping freehub?

garsr6

hey all,
as i was ridin tonight i noticed when i stopped peddaling and freewheeled for a while that when i started peddaling again it would take a few turns to engage. also when putting the power down occassionally skipped as it does when chain/cassette is worn.
every part of the drivetrain is nearly brand new as i have recently upgraded to xt, but my wheels are about 4 years old (shimano fh-m475 hub). i thought mabe the freehub, so i took wheel off and gave it a spin and it sounded pretty rough. does this sound like a normal problem?
i cant seem to find freehub body for said hub on all the usual shop websites, would other bodys (eg lx or xt) fit? or is it new wheels?

thanks

nicklouse

most will fit but all ways best to get the same grade due to the bearings. deore level will be fine.