It's possible the, ah, "mechanic" (in quotes because no he's not, if he pulled that crap) glooped it up with RTV not because the threads were bad but because the plug gasket was bad or missing. If you're fortunate enough to have good (or repairable-with-a-tap) original-size threads in the pan's drain plug hole, install a Chrysler part № 6035 417, which is a drain plug with a built-on, permanent, very beefy, non-losable steel-backed gasket that seals a whole lot better than a separate gasket ever did. Best buy that plug before removing the old one; any dealer will have it in stock.
If you're not fortunate and the threads are hosed, then the "mechanic" who hosed the threads can freakin' well pay for the repairs to put it back in the condition it was in before he hamfisted it.
