Hi there, the oil seems to be coming from the front diff and running down the "tail" shaft towards the transfer case. is it likelt to be from the front seal?
How hard is it to replace the seal for a weekend mechanical type? Any special tools needed ?
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the first place to check is then rear drive line "U" joints as fail on a regular basis and can be not allowing the shaft to turn properly
T check for diff , jack up one side and engage a gear
if the wheel spins then the diff is turning but if it makes a bad noise (all will rumble a t a low level in this position) the diff will be faulty
It is possible that a joint flange has come loose and the bolts are jamming on the back of the transfer case housing
With an AWD vehicle there is a diff in the transfer case that allows different speeds between front and read axles . If you have 4wd button (lever ) that allows the diffs to be locked for slippery /off road conditions then it can be driven with out the front drive shaft if you have it in 4wd. If you do not have that option then without the front drive shaft it will go nowhere.
your question is very brief making it hard to understand what you need to know , is your car manual or atomatic gearbox ?
if manual gear box then you may have one of many things , your clutch is worn out ,or maybe just the clutch slave cylinder , if 4wd is engaged does if move with front tire's if so rear tail shaft or diff broken .
if automatic , then you may have bands broken or blown gear box in both cases .
if 4wd drive try driving in 4wd using front wheel to drive vehicle , if it moves then rear diff or tail shaft is problem , if not gearbox is most likely dammaged
If the front differential is covered with oil, chances are that the leak is from the pinion seal on the diff itself or from an engine leak. check all the fluids and find what is low and clean off all the residue there so you can find the source. Since the t case is behind the diff, and the air flow is towards the rear (unless you drive backwards all day long) any leaks would tend to blow towards the back, not towards the front.Once you find the actual leak source, someone here can help advise you on how the repair can be made.
Two things happen when you select 4WD in this car. Moving the transfer lever physically selects the gears that will turn the prop shaft to the front diff. At the same time, a switch in the transfer box tells a pump to supply pressure to the diff engagement diaphragm in the front diff housing. This joins the diff spider gears to the front drive shafts. Once the air pressure remains fixed, the 4WD light on the dash will remain lit solid. Obviously, a number of problems could be causing your lack of 4WD. The most common would be the air line(s) from the pump (behind the front bumper, LH side usually) to the diff being pulled off, cut, or crushed during 4WD'ing. Failure of the pump, the relay control unit that powers the pump, the switch that turns it on and off are all possibilities too. As you have no 4WD lamp on the dash, you may have a blown globe too (unlikely) as this should flash if air pressure can't be maintained. You would still have 4WD! See if you can select 4WD with the ignition OFF and listen for any relay or pump noise. I'm not sure you can actually do this without the engine running, but it will be a lot easier to hear with the engine off. If you can hear the pump and everything else is OK, The problem may actually be in the diff. Good luck.
Check if the filler and drain plug is tightened, aswell as the reverse and 4wd(light indicator) switches on the gearbox is not leaking through the section where the wiring enters the switch, check the tail end of the g/box rhere the the drive/prop. shaft enters the g/box, a oil seal is located there and on the transfer case driveshaft driving the front wheels.