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Make sure you check your gear oil..There's a top and bottom bolt..Bottom for draining..Top for adding....I have took off the bolts around my gear shifter and lifted it up and added oil there...But gear oil will have a long tip on it...You can add a small clear hose onto it and squirt it into the hole..When it's full oil will start running out the top bolt hole..Then just screw it back in...Or take it somewhere to get it checked....2nd it could be your release bearing going bad..Add the oil first...Might solve your problem..Can't hurt...But you need to do it very soon
Put the rear up on jack stands and remove the wheels and brake drums. Then unbolt the rear differential cover and drain the gear oil. Then, you remove the pinion securing bolt. DO NOT ROTATE THE WHEELS AS THIS CAN CAUSE THE PINION GEARS TO FALL OUT. Push the rear axle shaft inward toward the vehicle and remove the "C" clip that secures the axle to the pinion gears. Then pull the axle shaft outward and out of the axle housing. Inspect the axle shaft for scuffing and excessive wear on the place where the wheel bearings rest. If there is excessive wear, you can use a "repair bearing", which is modified to install so it runs on an unworn part of the axle shaft. Otherwise a regular replacement bearing is fine. You need a slide hammer removal tool to extract the old bearing from the axle housing, and a bearing install tool to insert the new one without damage. Once the new bearing is in, reinsert the axle shaft, secure with the "C" clip, and pull outward to latch the "C" clip into its recess. Install the pinion bolt. Reinstall the differential cover with appropriate gasket or sealer. Fill differential with approved gear oil in the recommended amount. Ensure that if the rear is a positraction rear end there may be an additive required to the gear oil for proper operation.
The only place to put gear oil is in the "pumpkin". Otherwise called the rear-end. To do so, I recommend driving the car backwards onto two ramps to raise the rear end up in the air, this also tilts the car forward. Between the rear wheels, in the center of the axle, is a large metal container of gears and gear oil. There should be a large hex-headed bolt less than half-way from the bottom to the top on the rear, facing your back bumper. This is where the gear oil goes in, but after you take the bolt out, before you add any oil, stick your finger into the hole and try to feel the oil level. If you can feel it, you don't need any more gear oil to be added.
If it's a All Wheel Drive then it could be a gear oil leak that has caused a bearing in the drive train to fail. Just adding gear oil won't fix the problem, but may limit the damage until it's repaired.
If it's a Front Wheel Drive, then you may have a Wheel Hub Bearing Assembly failing. This usually has a ABS [ Anti-Lock Brake ] light associated with it.
Either is dangerous and should be checked ASAP.