DTT Noise Filter
I had the same problem on my '99 after I (Camping World) installed a Git-Kit.
Under an earlier TDR thread "TC Hunting Lockup" there is a discussion on this. There it was suggested I look into a DTT noise filter before going to Dodge for their tech bulletin 18-02-99 fix. I ordered one on 11-2, got it on 11-7 and installed it the same day - yesterday. No more hunt. Just the answer to the problem.
It took me an hour and a half, including replacing a broken soldering tip, sipping coffee and taking pictures of the process. Well worth the 37+12SH. It even comes with a nice little bag of electrical fittings you can put in your tool box -- SOLDER! spray clean electronic terminals and clean all four battery terminals (remove, clean and retighten one post and cable at a time and you won't lose power)
It's a wonder Banks doesn't say anything about - or offer -- this filter, they certainly know the problem is noise.