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

Clunking sound in front when braking

When applying the brakes or doing a front brake dive and you hear a clunk in the front of your Jeep XJ or MJ, check for the following:

Fix for maxed out Oil Pressure Gauge

Is your oil pressure gauge maxing out at 80psi?    Or does it show 0 pressure?   Here are the steps and common fixes for your Jeep Cherokee XJ

Jeep 4.0 Engines: How to Rebuild and Modify

Jeep 4.0 Engines: How to Rebuild and Modify (Sa Design)Has anyone picked up a copy of the Jeep 4.0 Engines book? Let us know your thoughts!In this Workbench title, veteran author and Chrysler/Jeep engine expert Larry Shepard covers the rebuild of an entire engine in exceptional detail. He also delves into popular high-performance modifications and build-ups. Step-by-step photos and captions cover each crucial step of the engine disassembly. He shows the inspection of all critical parts, including block, heads, rotating assembly, intake, and exhaust. Critical machining processes are covered, including decking the block, line boring, and overboring the block. The book provides exceptional detail during the step-by-step assembly so your engine is strong and reliable. Installing a larger-displacement rotating assembly (or stroker package) is one of the most cost-effective ways to increase performance, and the author covers a stroker package installation in detail.



What motor mounts do you use?

Liked the Iceland Fender Flares but missed the boat?

Iceland Offroad came out with XJ Fendor flares that looked amazing.   Problem is the company went belly up and pissed off lots of people by not refunding their money. 
Did you miss the boat before it sank?   Good News...a life raft arrived:
These are the same molds as Iceland flares 

Bolt and Nut Hardware Identification

For most, its hard to identify the grade or strength of a bolt by looking at it unless you know the labelling.     
Here's the rule of thumb:

  • no markings on the head = Grade 1 or 2.
  • 3 marks = Grade 5
  • 6 marks = Grade 8

For a more complete identification list:
Download the hardware identification chart here

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:


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