Mine does this also I got some codes from it about a month ago then everything cleeared up and worked great now it is back. The codes I got were P1783 trans temp, P1705 tran rng out of test rng, P1502 vss inter apcm functioning, P1501 vss out of self test rn, and P0500 veh spd vss er. These seem kind of random or are they related through one sensor? It is totally fine when driving very easy. Fluid is like new still cause it keeps leaking a little so I just keep adding it as it goes to keep it fresh!
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2004 P71 Dodge County Sherrif 158K
3.27 Trac-Lock, BBK 78mm TB/Plenum, 1/2 inch spacer, SCT XCAL 2 Tuner with BOC Tune, OBX LT Headers Kit, ACCEL Super Coils, Light back tinted Headlights and Clear Side markers, 8K 55W HID, Heinous Control Arms from ADTR, 17 inch 06 GT Premium Rims
Up next either cams, stall, or gears.