>I can still use OD, but when I decelerate, there is
> a crunching, grinding sound and slack in the driveline.
Sounds not too ominous.
The overrunning clutch, which is like an automatics sprag clutch, would make this raquet if the rollers are all boogered.
This is one of the least expensive modes of failure, provided the metal bits havent fouled everything else up.
Good luck,
Jarrid