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Author Topic: Life expectancy 4.0 I6  (Read 1802 times)

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Offline XJSteve

  • Winch Wench
  • Posts: 45
Life expectancy 4.0 I6
« on: August 18, 2011, 11:03:39 PM »
Hi all, this is a strange question but I've noticed somewhat of a pattern where the 4.0 engines in the Cherokee will last about 350,000 km but in the Grand Cherokee only about 250,000 km. I believe the Grand is about 300 lbs heavier  but I'm still surprised. Is there a difference in the engines Grand vs non-Grand?

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'99 XJ 5.5 " Rubicon Express, 33" tires, AW4, 4.0, ARB bumpers front/rear, Warn 9000 lb winch, Rockhard rollbar, Optimal yellow top, Cobra CB, bushwacker flares, Safari snorkel; saving-up for a 3" body lift

Offline JackstandJohnny

  • Talks waaay too much!
  • Posts: 4727
  • where Jeeps go to die
Re: Life expectancy 4.0 I6
« Reply #1 on: August 18, 2011, 11:05:09 PM »
grand is 700 lbs heavier give or take.  with completely garbage trannies that make those engines work harder.

thats my guess.  you'll usually go through two 42re trannies in a ZJ before you kill a 4l.  sometimes. just sayin'
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~ rescue green JKUR on 35s.  typical rubicon build

Offline Woolf

  • Budget Lift
  • Posts: 100
Re: Life expectancy 4.0 I6
« Reply #2 on: August 19, 2011, 07:34:18 AM »
My '94 Grand has 425K on the originaly 4L and it still runs great!  It is a 5spd though so that helps and it has been well maintained it's entire life!  Now its time to get bigger so she can enjoy the rest of her days out in the bush!
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Offline LukeDuke

  • Budget Lift
  • Posts: 159
Re: Life expectancy 4.0 I6
« Reply #3 on: August 19, 2011, 08:49:59 AM »
Just got rid of a XJ for a buddie that had over 500,000 on the clock with the origional engine.
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1967 C101 - in 1,000,000 pieces
1973 C104 - in 2,000,000 pieces

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