My sig is below but I got an 02 with a 47RE that is hunting for gears. Feels like driving in any gear and turning off the OD, at low speeds its manageable but at highway speeds its scary. Its not the TC locking up.
Ive changed the TPS twice once with timbo the other from dealer, Ive changed the ECM, the diodes on the alternator, flushed tranny added new ATF4+ fluid, changed the filter, and changed the governor pressure solenoid, there's no codes.
Any other suggestions or fixes I'm out of solutions. its been at the tranny shop last 3 weeks while we try to fix it.

 

Clean your negative battery leads just fixed min tonight had the same problem,actually your passenger side is the critical one because your alternator and computer grounds both go to it sounds crazy but mine has had this problem multilevel time and it always cures it