If the threads in the pan are still useable, just pick up a new plug at the dealer, clean the threads and reinstall. If the new plug is a little lose, you could try some thread tape on it.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed