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Rear wheels do not drive - Discovery Land Rover Cars & Trucks

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Have you checked your differential and your drive shaft, as well as your rear end gears.

Posted on Dec 01, 2008

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Why does my 4 wheel drive not work all the time?


Elaine,

not work, do tell what makes you think it dont work (a lamp) or tires slipping or dead tires. (by tires mean that and traction)??????????

what mode fails, of the many, and where.???????



first off, we dont know what your tires are touching.

on road, or off road. pavement or ICE or snow.

that matters big time . (you read manual and match MODE to Road)

your lost operators guide explains all that, right?

eg: how and when to use, 4wd, its all there. I promise.

ControlTrac 4-wheel-drive system



here are the mode. which one , gives you problems.



quote ford with comments.



What are the modes, and how do they differ?

(note this is the operational behavior of a 2008 Ford Expedition. Newer and older Expeditions will vary only slightly)



2H 2-wheel-drive with high range gearing (1.00:1) Rear-wheel-drive capability,

2-wheel electronic traction control system is enabled



4A 4-wheel-drive Auto with high range gearing (1.00:1) Full-time all-wheel-drive capability, ((best on pavement or any time)

Electronically adjusted torque split to front & rear wheels, Electronically variable center differential,

Front driveshaft & rear primary driveshaft allowed rotational speed difference,

4-wheel electronic traction control system is enabled



4H 4-wheel-drive with high range gearing (1.00:1) Part-time 4-wheel-drive capability, (not for dry pavement EVER)

Continuous 50/50 torque split to front & rear wheels, Electronically locked center differential,

Front driveshaft & rear primary driveshaft mechanically locked with no rotational speed difference,

4-wheel electronic traction control system is enabled



4L 4-wheel-drive with low range gearing (2.64:1) Part-time 4-wheel-drive capability, (off road usage, mostly)

Continuous 50/50 torque split to front & rear wheels, Electronically locked center differential,

Front driveshaft & rear primary driveshaft mechanically locked with no rotational speed difference,

4-wheel electronic traction control system is enabled, ESC and RSC are disabled



In 4A mode the center differential is electronically-controlled and rear drive wheel bias. The on-board computer monitors for any sign of rear drive wheel slip (loss of traction)

If loss of traction is detected, the center differential is told to send a share of the engine\'s torque to the front drive wheels. It will not let the front driveshaft turn at the same speed as the rear driveshaft.



What about traction management?

1997-2002 model Ford Expeditions offered an optional limited-slip rear differential (LSD). A conventional open rear differential was standard along with the conventional open front differential and the electronic locking center differential.

comment with out LSD, one tire can spin, on say ice.

but the other 3 tires dont, in full time.

Jul 04, 2014 | 2003 Ford Expedition

1 Answer

1987 dokota appears to go in four wheel drive but all wheels do not pull or move when stuck in snow or mud.


Technically you do not have 4 wheel drive, you have two wheel drive (possibly three-wheel drive). When you engage 4WD you direct power to the front and rear differentials. The front differential is an open style which means that only one wheel will drive, and the rear differential is likely the same type which means that you will only have two wheels driving the vehicle (one front, one rear). If the rear differential is a "posi-trac" or "limited-slip", then both axles should lock and drive the vehicle (hence, three-wheel drive), but this style differential is not as common as it once was.

Feb 07, 2011 | 1987 Dodge Dakota

2 Answers

What does a rear axle look like


Your rear axle is the part that runs between the two rear wheels. The shock absorbers and springs are always attached to it. On a rear wheel drive or four wheel drive vehicle there is a bulge in the center of the axle where the gears are located. On a front wheel drive car, the axle may just be a length of box steel. On a rear wheel or four wheel unit there are drive axles inside the housing that connect the gears to the wheels. On front wheel drive there is a spindle on each end with bearings and a flange to mount the wheel.

Dec 28, 2010 | 1994 Ford Crown Victoria

1 Answer

When in 2 wheel drive ,where's the drive ? ? front or rear,?? when driving the 4 wheel auto trans from what I understand, the 2 wheel drive drives from the rear. Does the 4wheel auto drive from the rear ...


you can tell by looking underneath the vehicle-if it is rear wheel drive (primary) the rear axle will have a 'pumpkin' in the center of the rear. I do not know of any 4wd that is primarily fwd-so I would think yours is rwd.

Dec 24, 2010 | 2002 Kia Sportage

1 Answer

How do I determine if the car is front wheel drive or rear wheel drive?


Generally, trucks, vans and large cars with big engines will have rear-wheel drive. Smaller, economy and compact cars are most often front-wheel drive. But you don't have to guess which one you have - find out for yourself.
jQuery('.intro .thumbnail').each(function(i,e){ jQuery(e).find('img').one('error',function(){ jQuery(e).remove(); }); }); Instructions

  1. Understand that front-wheel drive means the power from the engine and the transmission goes to the front wheels; rear-wheel drive means the power goes to the rear wheels. Four-wheel, or all-wheel, drive means all four wheels are powered.

  2. Open the hood.

  3. Find the front of the engine. The front of the engine is always where the belts are located.

  4. Look to see if the front of the engine is by the fender (side of the car). If so, then you have front-wheel drive.

  5. Check to see if the front of the engine is by the radiator and the grill (front of the car). If so, then you have rear-wheel drive.

  6. Look under the car near each front wheel. If you see an axle with a rubber boot (called the CV boot) on either end going into the wheel, then you have front- wheel drive.

  7. Look under the car between the rear wheels. If you see a large, metal, pumpkin- shaped thing (it's called the differential) with two axles coming out either side, then you have rear-wheel drive.

  8. Check both under the hood for the position of the engine and under the car for the axles to be sure, because not every car follows the rules for engine position and front- or rear-wheel drive (see Tips below for examples of cars with variations on this rule).


Good Luck

Nov 08, 2010 | Chevrolet Impala Cars & Trucks

1 Answer

EXPLAIN THE DIFERENCE BETWEEN THE FRONT WHEEL DRIVE AND THE REAR WHEEL DRIVE


FRONT WHEEL DRIVE IS THAT THE FRONT WHEELS ARE WHAT DRIVES THE CAR AND THE TRANSMISSION IS IN THE FRONT REAR WHEEL DRIVE MEANS THAT THE REAR WHEEL DRIVE THE CAR ALLWHEEL MEANS THE THE FRONT AND REAR WHEELS DRIVES THE CAR FOUR WHEEL DRIVE MEANS THAT YOU CAN HAVE ONLY TWO WHEELS DRIVE THE CAR OR AL FOUR WHATEVER YOU PUT IT IN

Oct 19, 2010 | 2002 Toyota Celica

2 Answers

Garage told me problem could be the drive train. What exactly is the drive train?


The drive train is what "Drives" the vehicle literally, and it consists of the engine, the transmission, the drive shaft, (if rear wheel or 4 wheel drive) and the front/rear axle. (Depending on front wheel drive, rear wheel drive, or 4 wheel drive)

It would sound like that garage is basically telling you that you need a new vehicle.

Jun 09, 2010 | Cars & Trucks

3 Answers

Rear cluch not working


Depends on what model and components you have:

{ ...
ENGINE TORQUE DISTRIBUTION – DIRECTING THE FLOW OF POWER
In an all-wheel-drive vehicle, engine power can be directed to all four wheels. Subaru Symmetrical AWD differs slightly from model to model in how it directs power to the wheels, depending on its transmission.

MODELS WITH FIVE-SPEED MANUAL TRANSMISSION – CONTINUOUS ALL-WHEEL DRIVE: A viscous-type locking center differential and limited-slip rear differential help distribute torque – normally configured at a 50/50 split front to rear. If wheel speed differs between front and rear axles, the center and/or rear differentials lock up to help distribute power to the wheels with the most traction.

MODELS WITH FOUR-SPEED AUTOMATIC TRANSMISSIONS – ACTIVE ALL-WHEEL DRIVE: An electronically controlled variable transfer clutch and limited-slip rear differential distribute power to where traction is needed. Sensors monitor parameters such as wheel slippage, throttle position, and braking to help determine torque distribution and direct it to the wheels with optimum traction.

MODELS WITH FIVE-SPEED AUTOMATIC TRANSMISSION – VARIABLE TORQUE DISTRIBUTION ALL-WHEEL DRIVE: As with Active All-Wheel Drive, an electronically controlled variable transfer clutch distributes power, but through a planetary-type center differential and a viscous-type limited-slip rear differential. Torque distribution is normally configured at a performance-oriented rear-wheel-biased 45/55 split front to rear. Sensors monitor the same parameters as for Active All-Wheel Drive.

WRX STI, WITH SIX-SPEED MANUAL TRANSMISSION – DRIVER CONTROLLED CENTER DIFFERENTIAL (DCCD) ALL-WHEEL DRIVE: The STI uses an electronically managed multi-plate transfer clutch and a mechanical limited-slip differential in conjunction with a planetary-gear-type center differential to control power distribution between the front and rear wheels. Featuring manual and three automatic modes, DCCD is normally configured at a 41/59 split front to rear. Sensors monitor parameters such as wheel slippage, steering angle, throttle position, and braking to help determine torque distribution and direct it to the wheels with optimum traction. DCCD also features a limited-slip helical front and Torsen® rear differential. ... }

And what are the symptoms? How do you know the coupling to the rear is not working?

Jun 05, 2010 | 1995 Subaru Legacy

1 Answer

Help me


Go look under the car & see if there are axles going to the wheels at the front & rear. 4 Axles & a driveshaft = 4 Wheel Drive.


No axles to the rear 2 wheels, it's Front Wheel Drive.

Only Axles to the rear, it's Rear wheel Drive.

Feb 07, 2010 | Ford Cars & Trucks

1 Answer

Rear scraping sound, Also when placed on lift and in gear (all wheel drive) the rear left wheel does not spin


Take it in for proper diagnosis - that's not supposed to happen in an 'ALL WHEEL DRIVE' - all WHEELS ARE SUPPOSED TO TURN.

May 20, 2009 | 2004 Hyundai Santa Fe

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