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Jeep Project CJ-7

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

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.

Trailering Safety and Trailer Hitch Information

Off-Road Truck Driving Techniques and Safety

25 Top To Do Tips Before Going Offroad


Got Pop-ups
Spyware & Viruses? feels your pain. Let our Geeks help you...


Rausch Creek
Off-Road Park


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

Onboard Air
Converting a York
AC Compressor
to Pump Air

What are HID Lights?

Onboard Air
Converting a York
AC Compressor
to Pump Air

Warn 9500i Winch Installation

Warn X8000i
Winch Installation


HEI Ignition
Installation & Review

Lockers, Limited Slips &
other Differentials Explained




Wheeling in the Valley of the Ferns

1.jpg (70086 bytes)
Tellico North Carolina

Paragon Adventure Park
Rock Krawl

Thousands more photos here..»





Detroit Locker - Automatic Lockers
Lockers, Limited Slips, Differentials
and the sport  of Offroading.

An Overview of Standard Carriers, Positraction & Limited Slips,
Locking Differentials, Spools and Mini-Spools

Detroit Locker
Detroit Locker



Detroit Locker - Automatic Lockers

Detroit LockerIn the world of locking differentials, the Detroit Locker has gained legendary notoriety.  The Detroit Locker was originally introduced as a No-Spin back in 1941 and later offered to the public as the aftermarket Detroit Locker in 1969.  Since then it has been the benchmark of lockers with many of its principles being used in other lockers.  Though it is not bulletproof, it is world renowned for its strength, durability and dependability thanks to its simplicity of design, and is the best known, most widely used automatic locking differentials on the market today with one of the largest number axle applications available including applications for C-Clip style axles.

Over the years the Detroit Locker has seen various improvements on its design.  Notoriously harsh and noisy characteristics of the earlier designs made it more suited to offroad use while later design improvements such as those found in the Detroit Soft Locker (Softlocker) removed much of the harsh banging and clunking characteristics during engagement and disengagement, making them somewhat acceptable on paved roads to the experienced offroader.

The Detroit Locker is an automatic locking differential designed to lock both wheels of the axle together automatically with power input, when forward or reverse torque is applied, so that both wheels are providing 100% power to the ground.  This action creates essentially a "spool" that solidly connects the axle shafts together.  When torque is not being applied, the Detroit Locker is allowed to unlock, permitting a differentiation variance in wheel speed while negotiating turns.  The later Soft-Locker design has a stronger case as well as a dampening mechanism to reduce banging and clunking characteristic to the earlier Detroit Locker. 

As an automatic locking differential, the primary drawback is their characteristics when they engage such as accelerating out of a turn or going from torque to no to torque to torque again such as when a manual transmission vehicle is shifting gears.  In these situations, the driver must be aware of the characteristics that will affect the handling of the vehicle.  For example during a turn the inside axle will spin slower than the outside axle, which is the basic purpose of the differential.  If torque is applied to an automatic locker during the turn it will engage due to the torque engaging the locker gears.  When the locker engages, it will cause the vehicle to push towards straight ahead or possibly to the inside of the turn.  The net effect is somewhat un-predicable handling characteristics when compared to open differentials.  These effects are much more noticeable in shorter wheelbase vehicles and smaller lighter vehicles. The odd handling characteristics will also be more apparent if road traction is compromised such as in rain or when the road surface is ice or snow covered.  Further noticeable characteristics of automatic lockers can be a banging or clunking noise during engagement of disengagement, delayed engagement, and added significant backlash, also known as slop, in the driveline.  Disengagement can be abrupt and sometimes a ratcheting noise can be heard when cornering.  Most people who use the Detroit Locker become accustom to these handling characteristics and adjust their driving style accordingly to accommodate it or just simply just get used to it.

Detroit Locker® Highlights

  • Fully Automatic Locking Action
  • Eliminates individual wheel spin-out for better traction
  • Extreme durability and reliability
  • No special lubricants required
  • Proven in thousands of installations
  • Easy to install, no special tools or case modifications
  • Choice of professional racers and off-road enthusiasts Around the World

     Service Parts List  ▪  Owners Manual

Eaton Detroit Locker - Detroit Lockers were originally manufactured by Tractech.  TracTech was bought out by the Eaton Corporation, who continues to produce the line of Detroit Lockers including the Eaton Detroit Truetrac Differentials, the Eaton Detroit E-Z Lockers and the Eaton Detroit Lockers.  Eaton is the world's largest independent producer of torque controlling differentials for vehicle manufacturers and the automotive aftermarket.

Below is a popular cutaway model of a Detroit Locker.  This tabletop model can be found at 4x4 shows, shops and vendors across the country.  It is an actual Detroit Locker that is hand operated to demonstrate the operation of a Detroit Locker.
Cutaway model of a Detroit Locker
cutaway model of a Detroit Locker
cutaway model of a Detroit Locker


Corporate Headquarters
Eaton Corporation
Eaton Center
1111 Superior Avenue
Cleveland, OH 44114-2584
Telephone: (216) 523-5000
Eaton Differentials
Detroit Locker








Differential Differences
Overview of Standard Carriers, Positraction & Limited Slips, Locking Differentials, Spools and Mini-Spools

Axle Related Glossary of Terms - Terms and definitions of Axle related components.


Other Detroit Locker Sources:

Detroit Locker - Eaton
The legendary Detroit Locker began the revolution in performance differentials and still leads the industry today as an Eaton brand.

Detroit Locker Install on Offroad Exchange
If you need the ultimate in traction then you need a locker! One of the best choices is the Detroit Locker.

Are there any drawbacks to installing a Detroit Locker in the front differential?

Installing a Detroit Locker
Super Chevy installs a Detroit Locker

Detroit Locker Install on

Installing a Detroit Locker

Installing a Detroit Locker

Installing the Detroit SoftLocker in a Toyota 8" Differential

Randy's Ring and Pinion / Detroit Locker Installation

Powertrax No-Slip Traction System Install, make that a Detroit Locker
This was one of those such projects where the installation of a Powertrax No-Slip Traction System ended up becoming a DIY Detroit Locker installation.

Detroit Locker brochure

Jeep Project CJ-7

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

All Terrain 
Mud Terrain
Tire Reviews & Info

All Terrain
AT Tire Reviews

Mud Terrain
MT Tire Reviews



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

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
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 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 MT
TrXus Mud Terrain
TrXus STS All Terrain
Michelin LTX A/T˛
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
Product Reviews
Tire Reviews
ATV Tire Index
Carlisle 489 Titan
Dunlop Quadmax
Dunlop Quadmax Sport
Quadmax Sport Development
Highlifter Outlaw
ITP Holeshot
ITP Holeshot MX
ITP Holeshot ATR
ITP Holeshot XC
ITP Holeshot XCR
ITP Holeshot MXR
ITP Holeshot XCT
ITP Mud Lite
ITP Mud Lite XTR
ITP Sandstar
Kenda K538 Executioner
Tubeless Bearclaw K299
Kenda Klaw K532
Kenda Klaw K533
Kenda K534 Sand Gecko
Maxxis M961/M962 Mud Bug
Maxxis Rooster Paddle Tire
Maxxis M917/M918 Bighorn
Maxxis M966 Mudzilla
Super Swamper TSL ATV
Super Swamper TSL Vampire
Super Swamper Vampire EDL
Swamp Lite ATV Tires
ATV Tire Mounting
ATV / Quad Links
Quad Tire Reviews Index


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


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

Jeep Trans Swap
T-18A Transmission Rebuild & Short Shaft Conversion

Black Diamond Suspension Lift install for CJ-7


From the
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!