I have a 2000 Dodge Grand Caravan with 3.8L engine and 4spd auto., recently and only when cold, it has started to slip (rpm's climb about 300 revs then drop) when shifting from 2nd to 3rd. Then it completes the shift and runs fine, have not a noticed slip from 1st to 2nd or 3rd to 4th. The trans filter and fluid was done last year at a local Dodge dealer and they did put ATF+4 in it (as stated on bill). The vehicle has 140,000km on and was bought
2 years ago second hand. Ay ideas or suggestions as to what is wrong, I would like some input before taking it to a shop and hearing a "needs complete rebuild" when it may just require an adjustment or something else.TIA.