Re: transmission problem...I guess
Difficult to tell without having seen the jeep. Did the transmission problem happen due to it standing still for 3 months, or is it standing still for 3 months because of a problem with the transmission?
You need to read the fault codes to know more or less what is going on with the transmission.
Quadra Drive has Vari-Loc differentials, they will lock automatically in case a speed difference occurs between 2 wheels on the same axle.