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Have a look at the RedLine website about manual transmissions:
http://www.redlineoil.com/products_gearlubricants.asp?categoryID=7
For the differential look at:
http://www.redlineoil.com/products_gearlubricants.asp?categoryID=6
I believe i used MTL or MTL-90 for the tranny. The 1989 Volvo is now
owned by my son. He has all the maintenance records.
For the differential i used the RedLine 75W90 gear oil.
I had a problem removing the filler plug on the M47 (manual 5 speed)
tranny. Make sure that you can remove the filler plug *before* draining
the box. I don't know what kind of tranny your car has. If it is similar
to the M47, then you should be able to "overfill" it a bit. I recall
getting about 2 liters of oil for the manual tranny. I added the oil with
a plastic bottle and a plastic Tygon tube. By squeezing the bottle you
can "push" the oil into the filler opening.
For availability of RedLine products, have a look at:
http://www.redlineoil.com/dealers.asp
There are many locations where this product can be purchased in the UK.