Front end noise in GU Patrol

Submitted: Thursday, Sep 08, 2005 at 14:25
ThreadID: 26267 Views:3113 Replies:8 FollowUps:7
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I have a 98 GU Patrol with auto hubs and a lockrite diff lock fitted to the front diff. I bought the vehicle about 6 months ago and after the first 4WD I found it hard to get the vehicle out of 4WD it took several reverse and forward motions to get it out. Ever since every now and then when turning around corners it is making a loud clunking noise. We have recently changed the oil to a standard 80/90 incase the problem was caused by poor oil and we have taken the auto hubs off to check for problems, they look fine but the clunking continues. If anyone has heard of this problem, or knows how to eliminate what it actually is I would be really greatful.
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Reply By: Leroy - Thursday, Sep 08, 2005 at 14:32

Thursday, Sep 08, 2005 at 14:32
Are you reversing enough to ensure the hubs are unlocked? If they are locked you will hear the lockrite lock and unlock as you go around corners!

Leroy
AnswerID: 129072

Follow Up By: jt - Thursday, Sep 08, 2005 at 15:10

Thursday, Sep 08, 2005 at 15:10
When we reverse the 4WD is definately disengaging as the tailshaft stops turning. Then when we travel on the road, occasionally when we take a corner the noise starts and when we get out and check the tailshaft is turning again with the gearstick in 2H. Do you know what type of oil shoud be used in these diffs, a std type or limited slip type?
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Follow Up By: Leroy - Saturday, Sep 10, 2005 at 20:03

Saturday, Sep 10, 2005 at 20:03
I would imagine the std type as they are not an LSD with the lockrite in and usually open so std is the go.

Leroy
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Reply By: Patrol Freak (NSW) - Thursday, Sep 08, 2005 at 14:37

Thursday, Sep 08, 2005 at 14:37
the lockrite diff locks &unlocks as you turn corners thats probably where the noise is comming from!
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AnswerID: 129075

Follow Up By: jt - Thursday, Sep 08, 2005 at 15:12

Thursday, Sep 08, 2005 at 15:12
Should the diff lock & unlock on corners when you are in 2H because this is when this is happening.
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Follow Up By: ACDC - Thursday, Sep 08, 2005 at 21:30

Thursday, Sep 08, 2005 at 21:30
Never seen a lockrite unlock yet! the theory's there but it does'nt work the natural windup between back and front diff keeps it locked.
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Follow Up By: GUPatrol - Thursday, Sep 08, 2005 at 23:59

Thursday, Sep 08, 2005 at 23:59
JT,
I went through this excercise on two patrols (mine and a friends).
I ended up changing to an ARB air locker and also changing the hubs to manual, the other one remained on the lockrite and is still doing it to this day, here is what happens.
On an open diff, when you reverse (in 2wd), the cam system unlocks the auto hubs sometimes one first the other one after (as they may be at different spots in the internal splines), you will hear a click on one side then a click on the other, once unlocked that is it...
When you have the lockrite (even if you were using it in manual locked position (by the way when changing from manual back to auto you don't disengage them, you then have to reverse for them to disengage)...
Back to the lockrite, which is always locked by default and unlocks when the cam system allows it to which is almost never as it was pointed out simply because the natural load between front and rear axles keep the load on...
When you reverse, the auto hubs work in the same way, as with an open diff however if they happen to be at different stages in the spline (that is one disengages earlier than the other) then the lockrite which is locked will drag it back to the locked position in reverse.
The only way to get both hubs successfully unlocked is by making sure both unlock at the same time while reversing (almost impossible).
The way I achieved it sometimes was reversing in a zig-zag until I decided to replace it for an ARB air locker, much better, later I also replaced the hubs for manual ones much better again....
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Reply By: flappa - Thursday, Sep 08, 2005 at 15:11

Thursday, Sep 08, 2005 at 15:11
AFAIK , you should change to Manual Hubs when you have one of these lockers.
AnswerID: 129085

Follow Up By: Bonz (Vic) - Thursday, Sep 08, 2005 at 17:52

Thursday, Sep 08, 2005 at 17:52
not true , you dont need to change to manual hubs flappa for lockrites
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Follow Up By: Patrol22 (Queanbeyan - Thursday, Sep 08, 2005 at 18:15

Thursday, Sep 08, 2005 at 18:15
No you don't have to change to manual hubs but it certainly is a worthwhile exercise if only to give you low range 2WD to reverse the trailer up hills on hard surfaces without having to slip the clutch. Best dam thing I've done and IMHO at $170 (AVM hubs from ARB) and 30 minutes work you can't go wrong.
Cheers
Pete
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Reply By: Patrol Freak (NSW) - Thursday, Sep 08, 2005 at 15:38

Thursday, Sep 08, 2005 at 15:38
iff hubs are like mine auto/man,always us man.auto can lock when you do'nt want & won't lock when you want them to which can be dangerous.Personally I prefer ARB Lockers
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AnswerID: 129089

Reply By: Ando80 - Thursday, Sep 08, 2005 at 16:05

Thursday, Sep 08, 2005 at 16:05
I know those hubs have a manual lock, do they have an manual unlock???? if so, try that, if not, I agree with a previous post and suggest fitting some manual lock and unlock ones as it sounds like your auto hubs are causing the probs. Normally they are reliable but the extra force from the locker may not be doing them any good.

And no, you don't need to use LSD oil as the locker doesn't work on friction pads like a LSD.

Best of luck

Ando
AnswerID: 129097

Reply By: See You - Thursday, Sep 08, 2005 at 19:29

Thursday, Sep 08, 2005 at 19:29
I reckon that you have broken something in th ediff. I would cease driving it and take it to a diff specialist before you do any more damage. If you are lucky you may have only broken a CV joint.
AnswerID: 129134

Reply By: Sarg - Thursday, Sep 08, 2005 at 21:21

Thursday, Sep 08, 2005 at 21:21
Why buy two types of diff oil???. Presume Patrols are modern enough to have a LSD in the rear and require LSD oil , so why not use this in the front diff as well. Been doing it for years on Tojo's.without any problems
AnswerID: 129172

Reply By: ACDC - Saturday, Sep 10, 2005 at 16:03

Saturday, Sep 10, 2005 at 16:03
What also is possible which i have, is a LSD in the front diff of my patrol.
The LSD centre is out of a navara back diff it's the same,works great!!
AnswerID: 129478

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