Jeep 4.0 well?

[Skools Out]

i've had 3 of those motors and they are good for 175 to 200 K miles then the rear main seals leak you just drop the pan replace the main bearings and the seals then it will go another 200 K tough motors if you ever rebuild one you should always make a stroker out of it with just changing the crank and rods to a 4.2 older 258 jeep motor. the 4.0 / 242 is one good motor.