Ok... 97 (auto) runs/drives/shifts great.
Once the engine warms up, I stop completely, put it in reverse and can hear a subtle grinding/gravelly sound... almost like a loose heat shield rattling. The noise occurs when stopped... as soon as I start moving, I can't hear the noise again. I have not observed the noise when the engine is cold.
I have checked underneath, but can't pinpoint the origin (no loose heat shields). Seems to only happen when in reverse, but have on only a few occasions noticed the noise when stopped and in drive.... trans/xfer case?
Mechanic is taking a look later this week, but thought I'd check with the pros first