Where is transmision fluid level check - 1988 Land Rover Range Rover

You do not say if it is a manual or auto.

Manual - The level fill plug is left hand side looking up at the gear box from underneath on your back, head at the engine end. Undo on level ground or a ramp if possible. You will need a imperial socket/spanner set.
When you undo the upper plug, which is about the middle of the box, you should find a clear red oil in side, is just below the thread level. You will not see this so use a pencil as a dip stick, only putting in an inch, do not let go of it, and if you find that the level is low check seals. If less than 1/4 inch don't worry.

Top as needed with gear box oil see owners hand book, or your local autostore. If if brown or milky coff coloured it is in need of replacement and any problems such as water ingress will need to be identified.

Autos is easy, dip stick in the engine bay up by the bulk head......though you will need to run the engine at some stage of checking this, and use you hand brake, engine in neutral. There is an oil filler tube to top to amke life a bit easier.

Get a service manual or book or try http://www.landroverweb.com/Land-Rover-Range-Rover-manual-pdf.htm

Charlie @ http://www.theoffroadstore.co.uk/