Front diff oil leak

I'm not sure about what gasket to check, but I've always left my manual tranny's connected to the transaxles and removed the axles at the transaxle. This made simpler by popping the ball joints out, thus allowing the hub assembly to swing away. Hope this helps.

Transmission oil is very viscous and will leak from the smallest opening. There is a set tension to do the pan screws up to and if you exceed that setting the gasket squeezes out and the oil will leak out. It is best to use an adhesive sealent on the tranny body first ,put up the gasket let it set for a few minutes . paut adhesive seealnt on the pan and bolt up with minimun bolt tension. After a few minutes retension the bolts correctly. As a firther check remove the inspection plate under the torque converter and check for oil leaks down the front ot the tranny behind the converter.

ou may need to remove the front pump and replace the seal on the pump and the converter seal as well

It sounds like you may have a rear main oil seal leaking which is not an easy fix as the transmission may need to be removed for the repair. If there is a pan or plate at the bottom remove it to determin if that's where the oil is coming from (around where the crakshaft connects to the flywheel or torque converter).

TRANSMISSION LEAKS COME FROM TRANSMISSION OIL PAN GASKET LEAKING.OIL COOLERS LINES LEAKING.LEAKING AT TORQUE CONVERTER FRONT SEAL.TRANSMISSION SPEED SENSOR SEAL LEAKING.FRONT AXLE SEALS LEAKING AND LEAKING AT TRANSMISSION COOLING LINES TO RADIATOR.CHECK ALL YOU WILL FIND LEAK.IF YOU HAVE FAST LEAK OR PRESSURE LEAK.WITH CAR RUNNING IN PARK EMERGENCY BRAKE APPLIED LOOK UNDER CAR IF YOU SEE FLUID LEAKING OUT IN LARGE QUANITIES.COOLER LINES LEAKING OR TORQUE CONVERTER FRONT SEAL LEAKING.IF YOU HAVE SLOW LEAK THE LEAKS HAS TO BE AXLES SEALS OR PAN GASKET LEAKING OR VSS SENSOR SEAL LEAKING.

List of possible locations for engine oil leaks:

Valve cover gasket
can,crank and oil pump seals.
rear main seal
oil pan gasket
Transmission oil leaks
Vents, dipstick,torque converter ( need to examine shell to pin point whether its the oil pump or a converter seal)transmission gasket,axle seals, drain plug.

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.

The gear box and the engine are separated by a clutch and flywheel in the manual and a torque converter in an automatic so I am little puzzled as to how water (presumably engine coolant) got into the gear box. That aside, the only remedy is to drain the gear box and replenish with new oil.
On the other hand do you mean that water is the engine oil if so this will need to be drained and renewed. The only source of water contamination in the engine oil, other than the inadvertent adding of water via the oil filler cap, would be a cylinder head gasket failure allowing water to leak from the internal passages into the oil ways. If that is the case the gasket will need replacing.

Faulty oil seal, simple as that, where it is will be for a garage to find.

There are three main oil seals, one each side of the gearbox (CV driveshaft seals) and the other which requires gearbox removal is the torque converter to gearbox oil seal. Hope its not that one!!

PS = I trust the gearbox level is correct and NOT overfilled as this will also happen,. Has anyone recently topped up trans and spilled fluid??

THE MOST COMMON LEAKS ARE THE TRANS FLUID PAN GASKET, THE NEXT IS THE TORQUE CONVERTER FRONT SHAFT SEAL.