well i just bought a 89 xj 4.0 auto the guy just replaced the rear main on his way to the shop xj drove fine no prob just leaking little oil he changed it and he says that it started knocking so when the xj gets here im going to check the oil pressure i dont thing that the motor is bad but not really sure i dont have the jeep at my house just yet i need to pay last payment and with the hoildays now it will be until jan to get it to the house it sucks but thats life got a great deal 500 new paint tires tranny no dents just headliner sag