How to check oil level

SOURCE: 1996 Nissan Bluebird auto sss .Problem: lost top gear?

more than likley find the trani needs replacing

SOURCE: HOW DO I CHECK MY VW CITI COLF GEARBOX OIL LEVEL?

about halfway down the gearbox facing the radiator is an allen key take this off oil should come out if not top it up

SOURCE: how do I check the gearbox oil level on a 2.1

This is a sealed Gear box and needs to be done by a proffessional , but just to give you an idea.
You need to start the car put in reverse for couple of minutes , thenput into drive for couple of minutes , back to park. Lift the car and again start the car (IN PARK) , then open the Transmission drain plug while running (could be a little messy for you) , when you open the plug if a little oil comes out , then oil i good , if not then you need to top the oil till it starts dripping oil out of the plug. As these models would take in what it needs and not more. After that put the plug back in its place and make sure that there are no leeks. Please remember that this has to be done before oil tempereture goes up , so you want to do while car is cold or other wise you have to stop and do again when cold

SOURCE: checking gearbox oil level on 92 Suzuki Swift manual

'92 Swift - LH side of diff housing, rearwards of the LH drive shaft. Has to be filled to this plug's level.

SOURCE: auto gearbox

if it has a dip stick under the bonnet you need to have the engine running with the box in neutral then dip the oil
if the engine is warm then it should read around the top mark, if the engine us cold then it should rear around the lower mark
if there is no dip stick then there is no way of checking the level and you will need to drain the box and re fill with the correct ammount through the gearbox breather on the top