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On a 2001 Jeep Cherokee Sport (XJ), there are typically two speed sensors: the vehicle speed sensor (VSS) and the rear axle speed sensor. The VSS is located on the transmission or transfer case, while the rear axle speed sensor is located on the rear differential housing. Here are some tips to locate the rear axle speed sensor:
1. Locate the rear differential housing: The rear differential is typically positioned towards the rear of the vehicle, underneath the rear cargo area. Look for the large metal housing connected to the rear axle.
2. Identify the speed sensor: The rear axle speed sensor is usually mounted on the differential housing itself. It will have a wiring harness connected to it.
3. Follow the wiring harness: Trace the wiring harness from the rear axle speed sensor. It will lead you to a connector that is plugged into the vehicle's wiring system. The connector may be located near the rear axle or along the frame.
4. Inspect the differential housing: Look closely at the differential housing for a small protrusion with a threaded hole. This is where the rear axle speed sensor is installed. It may have a retaining bolt securing it in place.
You probably have Quadra Drive. Your problem comes from lack of limited slip additive in the differential fluid.If the fluid was changed a long time ago, you better change it and add the limited slip additive. If it was changed lately, then just add the limited slip additive. Drive some tight figure 8 s after the fluid change, to let the additive work into the vari-lok differentials.
Sometimes the problem is a low fluid level in the T-case, so check that out as well.
FRONT AXLE ± 0.3 L (2 oz.)
C200F
1.7L (57.5 Ounces)
C200FE
1.7L (57.5 Ounces)***
REAR AXLE ± 0.3 L (2 oz.)
C213R
2.07L (70 Ounces)
C213RE
2.24L (75.5 Ounces)***
*Nominal refill capacities are shown. A variation may be observed from vehicle to vehicle due to manufacturing tolerance and refill procedure.
** Includes 0.9L (1.0 Quarts) for coolant reservoir.
***ELSD - add 118 ml (4 Ounces) of friction modifier.
Transfer Case (3.7L Engine)
Mopar® ATF+4 Automatic Transmission Fluid
Transfer Case (3.0/4.7/5.7L Engines)
Mopar® NV 247/245 Transfer Case Lubricant
Transfer Case (6.1L Engine)
Mopar® NV146 Transfer Case Fluid. Usage of other fluid/lubricants is NOT recommended.
Axle Differential (Front-Rear)
Mopar® Synthetic Gear & Axle Lubricant SAE 75W-140 (API-GL5) or equivalent with friction modifier additive.
On the Differential look at the rear of the Differential near the top and you will see a plug. You remove the plug and check the level by putting your finger into the hole. If the fluid touches the bottom of your finger it is at the proper level. If not, add fluid until it does.
Easy way to find out is to lift both rear wheels off the ground. Have someone turn one wheel and someone hold the opposite one if they both turn at the same time and in the same direction then you have a posi rear. If only one turns or the other turns in the opposite direction it is an "open" rear.
check the differential fluid in the rear differential. if the fluid is low, add fluid and see if the noise is still there, if the fluid level is ok see if the fluid appears metallic, if it is metallic looking or excessively thick it would be a good idea to have the bearings checked out. i am in the process of rebuilding a front differential on a 98 jeep grand cherokee for the same problem. the bearings inside the differential on the carrier and pinion gear were worn out causing a humming noise. if the wear is excessive the gears might also need to be replaced
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