80 series centre diff lock

Submitted: Friday, Apr 11, 2008 at 08:33
ThreadID: 56533 Views:1715 Replies:4 FollowUps:0
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Hi all,
The centre diff lock on my 80 series when cold seems to not want to play! However once the vehicle has been operating for about 10 mins it works fine, engages and disengages smoothly. I am suspecting the relay that sits next to the accelerator.

Any ideas please?

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Reply By: Member - David P (VIC) - Friday, Apr 11, 2008 at 08:43

Friday, Apr 11, 2008 at 08:43
Oil sludge cold? Creek crossings? Synthetic diff oil say 75W 90 front 75W 140 rear. Just sounds like contamination/rust. Just a thought....silverback
AnswerID: 297947

Reply By: Wayne (NSW) - Friday, Apr 11, 2008 at 08:46

Friday, Apr 11, 2008 at 08:46

When was the last time the gear box oil was changed?

The 80 Series gear box had very light gear oil in it. If the oil is too heavy or too old this might be the problem.

Once the gear oil is warm everything works fine, I would check the oil first.

AnswerID: 297948

Reply By: GerryP - Friday, Apr 11, 2008 at 21:31

Friday, Apr 11, 2008 at 21:31
Wasn't there a problem in this model where oil migrated into or out of the tranfer case from the gearbox? Someone else will be able to clarify this, but could that be the problem?
AnswerID: 298044

Reply By: Member - Howard (ACT) - Saturday, Apr 12, 2008 at 11:56

Saturday, Apr 12, 2008 at 11:56
are you sure that the centre diff isnt actually locking and that its not just a faulty centre diff indicator light.

personally i dont think the grade of oil makes any difference (provided its good clean oill)
I have always run 85/140 in diffs, gearbox and transfer case in my 92 gxl and it has never been touched with over 425,000 on the clock.
I also have a 97 model with the vicous coupling and I admit I only run 85/90 in that transfer case even though I still use 85/140 in diffs and g box.

hope you work it
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AnswerID: 298096

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