The 4.0L is a really a GOOD engine, I would say it is like the old JOHNSON/EVINRUDE 150 V6 loopers. Not the most powerful, not the best on gas, but just seems to run forever with a little bit of maintence and care. They do tend to be noisy when cold as the inline 6 design is prone to piston slap, and they are very unforgiving to being run hot(235 is the limit). The big down fall to them in the GRAND CHEROKEE is the trans that CHRYSLER put behind them in the GRAND. They used the old style CHRYSLER 4 speed slush boxes and many of them fail around 60-70K, but most all of them will need work before they hit 125K. The smaller CHEROKEE doesn't have this issue as they used the TOYOTA trans.
What year are you looking at?
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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