Chrysler Repair: Jeep Grand cherokee 3.1TD Auto Transmission Problem HELP, jeep grand cherokee, jeep uk

Question
Please can some one advice me I'm so confused I own year Nov 1999 Jeep Grand Cherokee 3.1 TD 300,000 KM.  I purchased the jeep in Feb 2006 within 6 weeks of me owning the automatic Transmission (Gearbox) had broken, got towed to a garage of which I never had much faith in them but would not drive so my hands were tied but after 5 months they returned my car to me (I live in France) I purchased a second hand transmission from a friend which had low mileage from rear end collision.  I have noticed after a few months the accelerator was hard and that the jeep doesn't have her normal power especially pulling off and taking her up hill, thought I had a fuel blockage problem have asked my normal mechanic to help advice me but he cannot solve advised I take her to jeep. She drove but she would stick at 40Km and take a few minutes to move forwards and gain speed as normal but once driving she would do 150 Km no problems but the moment you slowed down you was back to square one again.
I have taken her to a Jeep dealership in France, they had found the problem and that she was repaired so I keenly collected her paid the bill of 450 euros for a pressure captor and transmission oil and I think gaskets or seals sorry all in French. Left the garage and within a few minutes noticed when slightly touching the accelerator she is over revving and erratic on gear changes went straight back to the dealer who retested her have now informed me I need a new (Gearbox) Automatic Transmission. Jeep in the Uk informed that possibly the 1st Garage did not reset the new transmission to the computer and advised that when the fault code which would relate to the original broken gearbox appears delete this out reset her, drive her and test again. Jeep in France says that my car is too old for this procedure is this true.
I have never had any problems until she left the jeep dealership PLEASE HELP
Terri brum


Answer
Hi Terri,
The procedure of which Jeep UK speaks is called the Quick Learn Procedure. It has been a part of the repair process for these types of transmissions since the late 1980's. The purpose is to erase the old fault codes and then to adjust the operation of the transmission control computer to the  individual mechanical and hydraulic parameters exhibited by the repaired or newly replaced transmission as well as to any other specifics of the rest of the powertrain (e.g. the engine). The idea that a 1999 is "too old" for this procedure is not correct.
However, whether the failure to do the quick learn would prompt the failure of the transmission is uncertain. How many miles total has the 2nd-hand transmission been driven is a factor? Also, what are the current fault codes? Those should be determined (these are four-digit numbers prefaced by a P). Ask the dealer what causes them to conclude the transmission need to be replaced and what are the fault codes? Have they done the Quick Learn Procedure?
Let me know what you learn.
Roland