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If I understand you correctly the drive shaft you took out is actually a CV axle. The inner axle shaft goes into the diff. That is held in with a snap ring in the diff. It might not come out easy, sometimes they do, use a pry bar to pop it out. Be careful not to break or damage the aluminum housing. There have been times where I had to use a strong air hammer to beat on the back side of that flange to get the axle shaft out... It's sort of like taking a CV axle out of a front wheel drive car.
The CV axle stub (end with the axle nut on it) supports the wheel bearing, removing the axle then driving on it would cause the bearing to wear prematurely. I would not recommend this. The front differential is also sealed by the cv assembly, removing it would cause the diff fluid to leak out . CV shafts for this van run $50-80. I would replace if it is bad, instead.
Sounds like a hub bearing a nd a leaking axle seal to me. The two parts are seperate and have nothing to do with the other so it was just a coincidence that you noticed the leak after you heard the hub bearing. Replace the axle seal to stop the leak and then replace the hub bearing assembly to fix the humm because you have to dissassemble all of that to fix the axle leak anyway.
You need to replace the seal. If you are describing the driveshaft coming from the Transfer case, the part would be called a Pinion seal. You can price the repair by using this description and the Repair shop will know what you are talking about.
Sometimes people refer to the smaller shafts between the wheels and the front differential as driveshafts too. They are cv shafts or output shafts.
That will be a Huge job. The whole front diff must come out of the car and the case will need to be taken apart to even gain acess to the carrier side bearings.
The hub bearing is where the wheel bolts up is that maybe what you are talking about?
Also the axle seal isn't that bad to do you need to remove the cv shaft then it's just a simple remove the seal and install the new one.
But all of these jobs will be big ones.
I cannot see it, but I am guessing that you need to replace your axle seal. To do this,you have to pull your CV shaft out. Remove the tire, remove the caliper from the top of the rotor. Using a hammer on the back, remove the rotor. Take off the spindle (axle) nut, separate the axle (CV shaft) from the hub. Replace seal. It should pop right out. Good luck!
You don't have to remove the whole diff to change the seals, but you will have to seperate it where the shaft meets the carrier housing. There is a clip holding the passenger axle shaft in place that you have to remove to change the seal. The drivers side axle stub can be removed with a little force as there is a spring clip holding that side in.
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