Auszug aus dem 1977er Owners Manual
Quadra-Trac-Full-Time 4-Wheel Drive
Quadra-Trac is a registered trademark of Jeep Corporation signifying Quad (4-wheel) plus Trac (traction). This system is available only on models with automatic transmission and utilizes a unique controlled-slip third differential which automatically transmits continuous torque to both front and rear axles in direct proportion to their needs for maximum vehicle control, power, and traction. It is equally at home on the road or off the road it is ideally suited for 4-wheel drive operations in normal dry road conditions or in situations with mixed dry and slippery surface conditions In rugged off-road situations it constantly adjusts to the terrain, sending the right amount of torque to the axle where it’s needed. With the exception of the Emergency Drive and the optional Low Range Reduction Unit, the Quadra-Trac System operates automatically.
WARNING: All four tires used on vehicles equipped with Quadra- Trac MUST be of the same type and size and inflated within the specified pressure range at all times. Unlike tires could cause poor performance, poor steering, unusual noises, or premature wear of drive train components. Refer to Tires and Wheels section.
Emergency Drive
In some emergency situations – as in the case of the vehicle becoming high-centered or stuck due to wheel spinning – it may be beneficial to nullify the differential action between the front and rear axles by actuating the emergency drive control.
To engage the emergency drive, turn the control knob located in the glove box in a clockwise direction. A reminder light indicating EMERG. DRIVE will come on in the instrument cluster and will continue to glow until the emergency drive is deactivated. When the emergency has passed, disengage the emergency drive by turning the control knob counterclockwise. In some cases, it may be necessary to reverse vehicle direction for a slight distance to assist in deactivating the emergency drive.
CAUTION: Internal parts of the Quadra-Trac transfer case may be damaged if the vehicle is driven inappropriately in emergency drive. Do not spin wheels excessively under any driving condition.
Quadra-Trac Low Range Reduction Unit
The optional Quadra-Trac Low Range Reduction Unit (not available on Cherokee models with six-cylinder engine) provides additional gear reduction for maximum braking, control and torque at low vehicle speeds. Use it for rugged on or off-road driving conditions including trailer towing, for greater control of vehicle speed and direction.
To Engage Low Range Drive:
- Take foot off accelerator.
- Shift automatic transmission into neutral.
- When vehicle speed drops below 5 mph, engage reduction unit by moving lever (located on driver’s side of transmission tunnel just forward of the seat) fully forward (CJ-7 models) or up (Cherokee, Wagoneer and Truckmodels). Be sure you don’t stop at the neutral position which is for towing use only.
To Disengage Low Range Drive:
- Take foot off accelerator
- When vehicle speed drops between 10 to 5 mph shift automatic transmission into neutral and then pull (CJ-7models) or push (Cherokee, Wagoneer and Truck) on lever.
Towing Position
neutral position is provided so that it’s unnecessary to disconnect the propeller shafts when your vehicle is to be towed behind a Recreational Vehicle (RV) or in the event of a breakdown. Refer to „Recreational Towing“ in the Special Driving and Emergency Situations section.
If the reduction unit is infrequently used, it is recommended that it be engaged and operated for at least five minutes each month.
The optional Low Range Reduction Unit may be added to the basic Quadra-Trac unit at any time. Contact your Jeep Dealer for further information.
Quelle: 1977JeepOwnersManual.pdf
Weitere Info’s:
https://www.jeepfan.com/tech/jeep-quadra-trac-4wd-system/
http://jubileejeeps.org/quadratrac/index.htm
https://www.jeepforum.de/topic/54486-mit-quadra-trac-ins-gelnde/
https://www.jeep-forum.de/threads/mit-quadra-trac-ins-gelaende.54486/
https://forum.jeep-club.de/viewtopic.php?t=1747
Quadra Trac I ist ein einfacher, permanenter Allradantrieb mit elektronischer Traktionskontrolle,
Quadra Trac II ein Allradsystem mit zuschaltbarer Geländeuntersetzung
Quadra Drive II dasselbe, nur noch mit zusätzlichen Achsdifferentialsperre(n) (Grand Cherokee WL75 in Form einer LSD-Differentialbremse an der Hinterachse)