Not sure if the tranny is sticking or what but, I have a 1999 Grand Cherokee 4.7, and I recently had someone replace the radiator, and since then whenever I first start the car and drive, hot or cold, it seems to have a high rev when first going, and then it subsides after a bout a quarter mile, it revs up to 2k rpm and then acts normal, through the rest of the trip,even at stoplights.I checked and topped off the tranny fluid as a little came out when the tranny cooler lines were removed, and there seems to be plenty of coolant and I bled it and there are no bubbles there. Now, we did not originally fill the system at the bleed hole, we put it in the new radiator directly, and then saw that the coolant was not circulating well and the temp was going up (not driven while this was happening), and then started feeding the bleed hole and the temps regulated after coolant steam and pressure was released. The car does not overheat at all, but just high rev initial drive, and also it starts with a high rev as well!
Someone told me it could be wetness in the tranny cooler lines, but I am not so sure, the engine and tranny were fine until this, very well in fact, so I am wondering what could be causing this as I am concerned that the tranny may be under unnecessary stress. There are no codes either when I try and read from the ignition, done is all I get!! I am confused and worried that the guy that took it apart did not reconnect something, but I checked all the lines and everything seems connected!