• Make it easy to find technical articles, photos, videos, specs and product information for the Jeep Cherokee (XJ) and Comanche (MJ).

Diagnosing Jeep 4.0L Engine Noise

 Tapping or knocking?    

  1. If noise is higher pitching tapping, your likely to find:
    1. Stuck Lifter
    2. Loose Rocker Arms
    3. Clogged oil passage in the rod
    4. worn Cam lobes
  2. Lower pitch knocking
    1. crank bearings
    2. If noise is in the back and around the transmission, check for cracked Flexplate

Related Videos:

Air Intakes and Filters

There are many options for CAI or air intake upgrades for the XJ/MJ.   We can't list them all but here some random articles and useful links to help you decide:

Indian Pass

 Indian Pass Rd runs eastward to the Colorado River at Picacho SRA. The road is a 1+ difficulty.

  1. I-8 East from San Diego (~120miles?) 
  2. Olgiby Road North (13.1 miles)    (Note: There's a gas station 1 exit East of Olgiby Road on I-8)
  3. Indian Pass Road NorthEast (~10 miles) to 4-S Ranch  

What does JEEP stand for?

 Its funny when I hear a new meaning for JEEP.   Here's my list:

  1. Jeeps Enjoy Every Pothole
  2. Josh's Emergency Evacuation Project
  3. Just Empty Every Pocket
  4. Just Everyone Else's Parts
  5. Just Enough Essential Parts
  6. Just Enough Engine Power
  7. Just Expect Every Problem
  8. Just Eats Every Part
  9. Just Eats Every Penny
  10. Journeys Everywhere Even Potholes /  Pluto /  Poland

 Got anymore?


Interior Lighting

Interior Lighting writeups:

Can da Spam!

Hello all,
Sorry for the performance of the website.   I've had to do some major house cleaning and enabled spam protection.  Deleted and blocked a whole bunch of spammers.
We are trying to make the web a better place meanwhile there are tools who have nothing better to do but mess it up for others.
Pardon our performance, it should be better now.


Throttle Body Upgrades

So you want to squeeze as much horsepower and increase performance for your 4.0 in your XJ or MJ?   A bored throttle body is an easy upgrade to do just that.  

  • There are various sizes of bored throttle bodies ranging from 60mm all the way up to 68mm!  
  • HO 4.0Ls factory throttle bodys are 58mm.   Renix is 52mm.
  • The most commonly used size is the 62mm.   If your 4.0L is stroked, you may need something bigger than 62mm depending on your intake manifold bore.

Do It Yourself Links

How to Flat Tow an XJ or MJ

What is Flat Tow?

Means the vehicle wheels are all on the ground and connected via tow bar.   

What do I need to do?

Depending on your XJ Cherokee or MJ Comanche specs, the transmission and transfer case must be set correctly to avoid any damage to the drivetrain.

  • Automatic transmission should be in PARK.   
  • Manual Transmissions should use 2nd gear.
  • Transfer Case should be put in NEUTRAL.

Chrysler 8.25 Axle Information

All Chrysler 8.25 axles are c-clip.

91-96 XJ:  Chrysler 8.25 - 27 spline, 1.17" diameter shafts, 8.25" ring gear, 3" axle tube
97-01 XJ:  Chrysler 8.25 - 29 spline, 1.21" diameter shafts, 8.25" ring gear, 3" axle tube


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