80 Series Gearbox/Transfer Case oil levels

Submitted: Saturday, Feb 09, 2013 at 23:29
ThreadID: 100475 Views:7003 Replies:4 FollowUps:1
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In numerous forums I have read about the "common" issue where a seal fails between the gearbox and the transfercase. These same online discussions suggest one option is to instal an equaliser tube between the 2 x filler holes.

Having just purchased a 1995 80 series (poverty pack) with 400+ kms on the clock I thought I would purchase one and have it installed by a 4WD specialist whilst giving it the once over and service.

To my surprise they have refused to instal it, saying that their is no way that oil can "move" between these two assemblies, its impossible.

Can anyone clarify this for me?
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Reply By: Member - Phil G (SA) - Saturday, Feb 09, 2013 at 23:59

Saturday, Feb 09, 2013 at 23:59
Yep, they are correct. It was a problem on the 40, 55 and 60 series cruisers, but not the 80 and subsequent series.
AnswerID: 504433

Reply By: pop2jocem - Sunday, Feb 10, 2013 at 00:13

Sunday, Feb 10, 2013 at 00:13
With the earlier H55F gearbox as used with the 60 series and 70 series of around that vintage it was quite possible for transfer case oil to pass to the gearbox. You could replace that seal which involved a fair bit of work and the leakage would start again not that long after, or you could fit a tube between the two filler plugs and the oil would just find it's own way back into the transfer case. I did this mod on two Cruisers I owned and no problems. I never tried it myself but I have been told that you could fit the seal that was used with the auto gearbox and because it had double sealing lips pointing in both directions it solved the problem. Personally I found the tube solution worked for me.
I believe that all the 80 series used the later H150F or H151F gearbox and a different design transfer case. Basically the same box with slightly different 1st and 2nd gear ratios.
With these gearboxes there are separate seals for the gearbox and transfer case and drain channels between the two housings so if either the gearbox or transfer case seal leaked the oil would wind up on the road or your carport. This being the case, yes, a tube between the two filler plugs would not work for this type.
Have a look at the ID plates that should be fitted to the firewall under the bonnet. One of them should tell you the transmission type along with diff models.

Cheers
Pop
AnswerID: 504434

Reply By: Hairy (NT) - Sunday, Feb 10, 2013 at 13:54

Sunday, Feb 10, 2013 at 13:54
Yep, I had one fitted to my 60 series but no need on my 80 series.

Cheers
AnswerID: 504466

Follow Up By: PaulCranwell - Sunday, Feb 10, 2013 at 21:34

Sunday, Feb 10, 2013 at 21:34
To all of the responses to my query, thank you.

I am grateful that I took the 80 to a specialist, otherwise I would have fitted myself and never given it another thought.

My only disappointment is that someone has advertised such a mod for an 80 series, and took my hard earned
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FollowupID: 781325

Reply By: get outmore - Monday, Feb 11, 2013 at 00:44

Monday, Feb 11, 2013 at 00:44
Waste of time on either. Had one on my 75 and oil would transfer from my tc to the gearbox.
But the gearbox is lower than the tc
So basic physics meant the transfer tube did totally js
Periodically I would drain and refill
AnswerID: 504504

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