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  Project CJ-7
Jeep Project CJ-7

An ongoing Budgeted Rebuild/Build up of a Rock Crawling Machine.

Jeep Central
From Jeep History to Tech Specs and Projects.  This section is all about Jeeps.
Jeep Technical Info
Engine Swaps

Installing 23,000 Volt Offroad Lights

What are HID Lights?

Onboard Air
Converting a York
AC Compressor
to Pump Air

Warn 9500i Winch Installation

HEI Ignition
Installation & Review

Lockers, Limited Slips &
other Differentials Explained

Jeep Dana 300 TeraLow - 4:1 Gearset for the Dana 300 Transfer Case


Smoke rises out of the ground, the smell of sulfur is in the air, the ground collapses as homes are destroyed.
Science fiction?
Think again.


2007 Jeep Wrangler JK
Jeep Wrangler JK Specs

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Hummer H3

Jeep Commander Articles and Reviews

Jeep Grand Cherokee Articles & Reviews

Nissan XTerra Articles and Reviews

Jeep Grand Cherokee Articles & Reviews

Jeep Rubicon Articles and Reviews

Jeep Rubicon Unlimited Articles and Reviews

Suspension Lift Installations and Reviews





Rocky ground

This type of terrain is one where vehicle type is very important. Ground clearance and suspension travel are two of the main criteria. High ground clearance allows the larger rocks to pass underneath without contacting vulnerable vehicle parts while good suspension travel allows the wheels to remain in contact with the ground.

Independent suspension usually provides a smoother ride in this type of terrain, but its design limits the wheel travel and ground clearance available. It goes without saying that rocky ground should be attempted at low speeds to minimize vehicle contact with the terrain.

While independent front suspension generally provides a smoother ride, it has a variable ground clearance to the front diff. As the front wheels hit a bump, the wheels rise up to absorb the bump. However the diff remains in the same relative position, effectively reducing the ground clearance under the diff. This can result in the diff hitting the ground, even though the obstacle under the diff was only half the height of the static ground clearance.

Live axle front suspension generally does not provide as smooth a ride as independent front suspension. However many live axle suspensions are now fitted with coils rather than leaf suspension, which   significantly improves ride comfort. The advantage of live axles when off road is that when the wheels hit a bump, the whole axle rises with the wheels to absorb the bump. This maintains the same clearance from the diff to the ground.

While this is an advantage off-road, the fact the weight of the entire axle and diff is constantly moving with any  bumps leads to a rougher ride, compared to independent front suspension.

When large drop-offs or ledges are encountered, they can be tackled at an angle to allow one wheel at a time to mount the obstacle. Bear in mind how this will affect the position of the vehicle as turning at an angle to a down hill ledge may result in the side rollover angle being reached.

 Gravel roads

Traveling on long straight stretches of gravel roads can lull the driver into a false sense of security. Modern 4WD's can make a relatively rough road seem smooth with their long travel suspension and sound deadened interiors. Speed creep can occur in these circumstances and when a bend is encountered the high centre of gravity in most 4WD's may cause you to cross to the other side of the road or it can lead to a high risk of rollover.

If a sudden obstacle e.g. a kangaroo, appears it is very important not to swerve while braking. This goes for any road surface and not just gravel roads. However it is more critical on gravel roads as once a skid or slide starts, it is very difficult, if not impossible, to regain control. There are exceptions to this rule such as a truck heading straight for you at high speed. It is better to avoid a collision with the truck and take your chances hitting a roadside object than to have a head-on collision. However, neither of these options are particularly attractive and it is for better to be travelling at a safe speed for the conditions.

In part-time 4WD's it is best to use 4WD on gravel roads to gain the better traction and road-handling of 4WD. Gravel roads provide enough slip not to cause any transmission windup problems. It is not necessary to use the centre diff lock of permanent 4WD's on gravel roads.

 Corrugated gravel roads can cause severe vibrations that con cause vehicle damage as nuts rattle off and vibrations damage electrical components. It is quite common for glass food containers to shatter even when stored in eskies. The key to minimize these problems is to find the right combination of vehicle speed and tire pressures.

Increasing vehicle speed until it 'planes' over the corrugations con reduce vibration significantly, but the planing speed may be too high for the driving conditions. Depending on the corrugations, planing speed is around 60-80 km/h. Lowering tire pressures reduces vibration as the tire sidewalls act as shock absorbers. However this causes the tire to heat up and can lower tire life or even cause tire failure. It is sometimes better to sacrifice tire life and lower tire pressure to reduce the damage being caused to the vehicle, as well as the comfort of the vehicle’s occupants.

After driving long distances on poor quality roads, it is a good idea to check all nuts and bolts to see they haven't vibrated loose. It is especially important to check all suspension components. The easiest way is to use an adjustable and when a loose nut or bolt is found, use the proper size wrench or socket to tighten it rather than risk rounding the head.

Dust Control

When driving on dusty roads, its a good idea to have all your windows closed and the ventilation control set to outside air with the fan on high. This pressurizes the vehicle interior slightly and helps reduce the amount of dust sucked into the vehicle. When another vehicle approaches, move the ventilation control to "recirculate" to stop dusty air coming in. Remember to move the ventilation back to outside air once you have passed through its dust trail or else the pressurization effect will be lost. In hot weather, vehicles without air-conditioning have to make a choice between minimizing dust intake or winding the windows down for the (cough) fresh air.

The biggest problem area for dust intake is from the rear tailgate. Check that the rubber seals are in good condition and that they seal when closed.


Offroad Tire Info
P-Metric Tire Sizes Conversion to Inches
Tire Terminology
Wheel Terminology
How to Pick the Right
Tires for your Truck
Truck Tire Info
Tire Sizes Clearance Chart
Tires - What Hits What Fits
All Terrain  Mud Terrain
Tire Reviews & Info
Mud Terrain MT Tire Reviews
All Terrain AT Tire Reviews
Super Swamper Bogger
Super Swamper SSR
Super Swamper SX
Super Swamper Vortrac
Interco IROK TSL
Super Swamper LTB
Super Swamper TSL
Super Swamper TSL Radial
Super Swamper Narrow
Interco SS-M16 Swamper
Thornbird TSl Radial
Thornbird TSl Bias
Thornbird TSL
Parnelli Jone Dirt Grip
BFGoodrich Krawler
BFGoodrich MT T/A KM
BFGoodrich MT T/A KM2
BFGoodrich AT TA KO
BFGoodrich Mud King XT
Bridgestone Dueler MT
Cooper Discoverer ST
Cooper Discoverer STT
Cooper Discoverer ST/C
Federal Couragia MT
Firestone Destination AT
Firestone Destination MT
General Grabber MT
General Grabber AT2
Green Diamond Icelander
Ground Hawg Mud Tire
Hankook Dynapro MT
Hankook Dynamic MT RT01
Hercules Terra Trac MT
Hercules Trail Digger MT
Kelly-Springfield Safari DTR
Kelly-Springfield Safari MSR
Kumho Road Venture MT
Kumho Road Venture KL71
Kumho Road Venture AT
Dick Cepek Mud Country
Dick Cepek F-C II
Dick Cepek Fun Country II
Dick Cepek Fun Country Nylon
Dick Cepek Fun Country Kevlar
Mastercraft Courser MT
Mastercraft Courser HTR
Mastercraft Courser HTR Plus
Maxxis BigHorn Radial
Maxxis Creepy Crawler
Maxxis Trepador
Maxxis Buckshot Mudder
Maxxis MA-SW
Maxxis M-8080 Mudzilla
Maxxis MT-754 Buckshot
Maxxis MT-753 Bravo
Maxxis MA-751 Bravo
Maxxis MA-S2 Marauder II
Maxxis MA-S1 Marauder
Maxxis MT-762 BigHorn
Nitto Mud Grappler
Nitto Trail Grappler MT
Nitto Terra Grappler
Nitto Dura Grappler
Nitto Dune Grappler
Nokian Vatiiva MT
Pit Bull Rocker Extreme
Pit Bull Maddog
Pit Bull Growler
Goodyear Wrangler MT/R
Pro Comp Xterrain
Pro Comp All Terrain
Pro Comp Mud Terrain
Pro Comp Xtreme AT
Pro Comp Xtreme MT
Toyo Open Country AT
Toyo Open Country MT
TrXus Mud Terrain
TrXus STS All Terrain
Michelin LTX A/T²
Michelin LTX AT2 Press
Michelin LTX AT2
Mickey Thompson MTZ
Mickey Thompson MTX
Mickey Thompson Baja Claw Radial
Mickey Thompson Baja Claw Bias
Mickey Thompson Baja Crusher
Mickey Thompson Baja ATZ Radial SLT
Competition Claw
Dunlop Mud Rover
Federal Couragia M/T
Nitto Dura Grappler
Yokohama Geolandar
Dick Cepek's 2008 F-250 Super Duty Project Vehicle – Project CRUSHER
Mud Tire Reviews

FJ Cruiser

Engine Specs
Drivetrain Specs
Photo Gallery
FJ Cruiser Tires
Press Releases & Specs
FJ Cruiser Reviews

Paragon Adventure Park
Rock Krawl

Thousands more
photos here..»


Off-Road Lights
by LightForce Product Review / Installation.
from Off-Road Lights


Black Diamond Suspension Lift instal

 for CJ-7

Ramp Travel Index
RTI / Ramp Travel Index What it is and how to calculate it, with and without the ramp.

Offroaders Guide to Gearing up for Offroad
From Basic Equipment to Well Equipped.  An extensive list guide to help you prepare your vehicle for the offroad.

Do it Yourself
Detriot EZ Locker Install  in a 92 Toyota 8" rear

For all the Jeep
Fans out there!

Department of Cheap Tricks and Useful Tips
Ultra-Cool Hand Throttle for Free!

Jeep V8 Swap Tips

The Exploding Clutch

Radiator Protection using 6 bucks worth of material

Cracked Under Pressure - Fixing a smashed fingernail

A Cheap, effective alternative to undercoating

Home-built Saginaw Gearbox Brace for the cost of lunch!

Ammo Box Storage - Mounting Them for Quick Disconnect

Home-built Serious Skid-Plate protection for the Oil Pan for under 20 bucks!


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Knoebels Amusement Park