its would be better for them if you move them alot!  the more you move them the better they will move.  and your fuel economy will go down and it will ware out parts in the front end quicker(just a little).
stu
[off-topic]Hey BigTracker, did you visit my website ? ( looking at the new "Got NOS" smiley  ;D )[/off-topic]
no, i "barrowed" this from a guy on another forum ;D  whats your web site?
stu
The thing that sucks about the auto's is that they unlock when you go into reverse, so if your rocking or something you can grenade a front end pretty quick. Needless to say i ditched my autos.
I've never managed to wear out a set of hubs although, one of the hubs on one of my Ford pickups had a sudden, short, intimate relationship with a large rock, a few years ago, which was extremely detrimental to the physical well being of the hub. Didn't seem to faze the rock at all.
Been there, done that.
We broke 2 front housings and one pinion/ring set with our autos.  FINALLY corrected my cranial/rectal inversion problem and got manual hubs and we never broke anything up front again.
~Nate