Change oil in g'box,t'fer & centre diff in 80 series

No advice on oils as I used the 75/90 castrol in the g/box and am unhappy I also dont have a centre diff. However from DIY oil changes i have learned this
Use a 15/16 inch socket NOT a 24 mm and if you can get a 6 side socket all the better
Undo your filler bolts BEFORE the drain bolts (I ended up having to take one vehicle to a mechanic to get the filler removed)
DONT do them up as tight as they probably are now- remember you will have to service it again later. Just as tight as you do for your oil filter is all it needs
DONT underestimate this advice these plugs are often jamed in tighter than a 12 year old and are reeeel easy to strip

Woody,

There are two drain plugs, one for the transmission and the other for the transfer case. The one that is on the centre diff is the transfer case and they use the same oil.
For the Gear box use SAE 75W/90 or GL5 and it will take 2.7 litres
For the transfer box use the same and it will take either 1.3 or 1.7 litres.

Stick to these oils as the gear box does not like heavy oil.

Wayne

Big Woody.

I've got a 94 80 series petrol and also used Synforce All terrain 80 in the gearbox and All terrain 90 in the diffs. The gear oil makes a huge difference to 80's. Much quicker and slicker gearshifts. I'm sold on it

Good luck

Greg

Caution !

First check if you have a rear LSD.

Normal gear oil will stuff the clutch plates.

Regards Derek

Not sure about Synforce but the Toyota use's Mobil fluid 424 in the box. It is an 80grade which sounds similar.
The equivalent in Caltex is Textran.
The 80 series box's don't like oil with EP in it. (Extreme Pressure). If it is hard to select 1st and 2nd use the above fluids. It will make a big difference.
I use ls90 in both front and rear diffs on vehicles with constant 4wd. Much better oil. Transfer case 80w/90.

Another god oil for 80 gearboxes is castrol vmx-m...(m for mitsubishi) semi synthetic and light.
Andrew