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

Submitted: Thursday, Jan 26, 2006 at 15:04
ThreadID: 30138 Views:4269 Replies:6 FollowUps:4
This Thread has been Archived
Hi All,

I don't have a manual yet but would like to change the oil in the gearbox, transfer case and centre diff in my 91 model 80 series cruiser today if possible.

Can someone please tell me the grades of oil that are specified in the manual and if anyone has tried oil grades that differ from what is recommended, do you have feedback on the difference?

Also I have just been lying under the car having a look. There seems to only be 2 drain plugs. One for the gearbox and one on the back of the centre diff. Does this second one also drain the transfer case which means they must run on the same oil?

Thanks for your help.
Back Expand Un-Read 0 Moderator

Reply By: Member - Davoe (Widgiemooltha) - Thursday, Jan 26, 2006 at 16:47

Thursday, Jan 26, 2006 at 16:47
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
AnswerID: 151107

Follow Up By: Big Woody - Thursday, Jan 26, 2006 at 19:01

Thursday, Jan 26, 2006 at 19:01
Hi Davoe,

Thanks for the advice mate. I learned 20 years ago on my 75 series troopy how soft Japanese metal could be as well always undoing the filler plug before draining the oil.
It is good advice for the newbies though.
I ended up getting Synforce synthetic oil and the gearbox feels great.
These are the oils that I have put in:

Engine - Synforce Cruiser Oil (Synthetic) 15w - 40
Gearbox/Transfer - Synforce All Terrain 80
Diffs - Synforce All Terrain 90

I forgot to get the Synforce grease but I will grease everything on the weekend.

Brett
0
FollowupID: 404714

Reply By: Wayne (NSW) - Thursday, Jan 26, 2006 at 17:15

Thursday, Jan 26, 2006 at 17:15
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
AnswerID: 151114

Follow Up By: Big Woody - Thursday, Jan 26, 2006 at 19:06

Thursday, Jan 26, 2006 at 19:06
Thanks Wayne,

I was on the right track it seems but at least now I know that I didn't miss a secret plug for the transfer case somewhere.

I got the job done and used Synforce synthetics right through the truck.

This is what I put in:

Engine - Synforce Cruiser Oil 15w-40
Gearbox/Transfer - Synforce All Terrain 80
Diffs - Synforce All Terrain 90

The gearbox feels heaps better, really smooth changes now.

Cheers mate,
Brett
0
FollowupID: 404716

Reply By: Patroleum - Thursday, Jan 26, 2006 at 21:01

Thursday, Jan 26, 2006 at 21:01
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
AnswerID: 151168

Follow Up By: Big Woody - Thursday, Jan 26, 2006 at 22:51

Thursday, Jan 26, 2006 at 22:51
Thanks for the feedback Greg.
It is comforting to know I have not made a bad move.

Brett
0
FollowupID: 404778

Reply By: 4145derek - Thursday, Jan 26, 2006 at 23:13

Thursday, Jan 26, 2006 at 23:13
Caution !

First check if you have a rear LSD.

Normal gear oil will stuff the clutch plates.

Regards Derek
AnswerID: 151209

Follow Up By: Big Woody - Thursday, Jan 26, 2006 at 23:19

Thursday, Jan 26, 2006 at 23:19
All is OK Derek.

The Synforce lubricants are suitable for all LSD's, locked diffs and standard diffs so all will be fine.

Thanks for the warning though.

Brett
0
FollowupID: 404790

Reply By: 120scruiser - Friday, Jan 27, 2006 at 16:19

Friday, Jan 27, 2006 at 16:19
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.
AnswerID: 151308

Reply By: Member - DOZER- Saturday, Jan 28, 2006 at 20:28

Saturday, Jan 28, 2006 at 20:28
Another god oil for 80 gearboxes is castrol vmx-m...(m for mitsubishi) semi synthetic and light.
Andrew
b4 you bag me out, walk a mile in my shoes, then your a mile away and have my shoes :)

Member
My Profile  My Position  Send Message
Classifieds: Landcruiser 200 series /100 series 4 alloy rims with tyres and nuts GC

AnswerID: 151518

Sponsored Links

Popular Products (13)