GQ patrol with bad front end vibe

Submitted: Monday, Sep 08, 2003 at 22:46
ThreadID: 7121 Views:2145 Replies:10 FollowUps:2
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Hi all , just wondering if anyone can help out here, my son has a 4.2.petrol GQ patrol, Recentley it has developed a very bad shudder when applying the brakes at about 80kph, just wondering if anyone else has ever had this prob , and if so , could theyplease shed some light , Thanks all , awaiting your responses
DAVE
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Reply By: Truckster (Vic) - Monday, Sep 08, 2003 at 23:26

Monday, Sep 08, 2003 at 23:26
Wheel bearings?
Tire balance?
Warped Discs
Front end bushes on control arms, etc
Chunk out of a tire maybe?

Theres a few to start checking :)
AnswerID: 30527

Reply By: squiz - Tuesday, Sep 09, 2003 at 07:38

Tuesday, Sep 09, 2003 at 07:38
wrapt break rotors

Depending on how much wear you
can get them resurficed.
AnswerID: 30545

Reply By: Member - Eric- Tuesday, Sep 09, 2003 at 08:13

Tuesday, Sep 09, 2003 at 08:13
check disc , a machine wont hurt , Craigs hut 2003
AnswerID: 30550

Reply By: herkman - Tuesday, Sep 09, 2003 at 08:52

Tuesday, Sep 09, 2003 at 08:52
Where do you live, I might be able to direct you to a top notch operator on front ends.

Regards

Col Tigwell
AnswerID: 30552

Reply By: Catherine - Tuesday, Sep 09, 2003 at 12:29

Tuesday, Sep 09, 2003 at 12:29
David

I have the same problem in my GQ. Its a 4.2 diesel, and whenever we go over a rut or any bumpy part of the road at between 70 - 80km an hour, the whole front end shudders, the gear stick wobbles like its about to pop out and the steering just goes beserk. THe only way to stop it is to break really really suddenly, and drop the speed to about 40km an hour, then speed up again slowly.

I have had the problem for ages, and had the tyres replaced, one - because they needed it, and two - hoping it would fix the problem, but no did do.

The next thing we did was got the suspension checked - that was all fine.

Had a wheel balance and tyre rotation, which stopped it for a bit, but then it came back again.

We still do not know what is causing the problem but for the moment it seems to have stopped, so will wait and see what happens when we start doing the rough stuff again after winter.

Sorry I couldnt help further, but your sons problem really rang true.

Cheers.

Catherine.
AnswerID: 30566

Reply By: Red Rover - Tuesday, Sep 09, 2003 at 12:40

Tuesday, Sep 09, 2003 at 12:40
Oh yeah been there done that. Horrible. Had it on the MQ. Turned out to be the castor alignment. Could aslo be the pads, rotor, jamming calipers. It's a start
AnswerID: 30568

Reply By: Gerry - Tuesday, Sep 09, 2003 at 14:13

Tuesday, Sep 09, 2003 at 14:13
Hi David

Had the same problem myself (although not quite as bad by the sound of it). I tried all the usual things (tyres, alignment/balance, shockers etc.) and nothing seemed to fix it completely. I eventually had it properly checked out by a 4WD specialist and found several things needed doing. Firstly, because I have raised the vehicle by 2 inches, my castor angle was almost non existent. A couple of the rubber bushes at the diff end of the trailing arms were also stuffed - so I had them replaced with offset bushes to bring my castor back to 3.5 degrees. Secondly, the bearings top and bottom of the big steering knuckles on the end of the diff housing were also stuffed with flat spots well worn into the bearing surfaces. These were also replaced. In all, the above work plus having the CV joints cleaned and regreased while they were out, all new seals and gaskets and a change of oil in the front diff, set me back just under $1500.

Sounds like a lot but my car has done over 320,000 hard k's and this has made an incredible difference - like a new car with no wobbles whatsoever. It took them 2 days to do the job so I reckon it was well worth it.

I had it done by Alltrac 4WD in Adelaide - very helpful and very good quality work.

Cheers
Gerry
AnswerID: 30574

Follow Up By: Member - David - Tuesday, Sep 09, 2003 at 16:27

Tuesday, Sep 09, 2003 at 16:27
Hi Gerry thanks for the response , i live in Adelaide so think a trip to alltracs is in order ............And i would like to thank everyone else who has responded as well , will keep you all informed when we find out more , might be able to help someone else with the same prob.
Cheers Dave

BTW , we have 5 patrols in our family , this being the first time we have encountered any probs ........they range from a 84 MQ lwb wagon to a 95 4.2 injected lwb wagon and 1 4.2 diesel lwb wagon, have owned patrols since 82 , and wouldnt own anything else ........
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FollowupID: 21621

Reply By: Spanky in NSW - Tuesday, Sep 09, 2003 at 16:15

Tuesday, Sep 09, 2003 at 16:15
Just sell it and buy a TOYOTA

OH WHAT A SSSHHHUUUDDDDEEERRRRRRRR My NISSAN
AnswerID: 30582

Follow Up By: Member - David - Tuesday, Sep 09, 2003 at 16:22

Tuesday, Sep 09, 2003 at 16:22
Hey spanky
thanks for the advice mate ,but i dont need a rust bucket .....lol
Cheers DAVE
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FollowupID: 21620

Reply By: ken - Tuesday, Sep 09, 2003 at 22:58

Tuesday, Sep 09, 2003 at 22:58
i have the answer we had it our selves on the top and bottom of the front axel at each side above and below of the ball there is a plate bolted on . jack up one side at a time and remove each plate there are shins under each plate remove some on each one. this tightens the bearing and will stop the vib if u take to many out the steering will be come heavy .try this and then replace some if to heavey easy job good luck.ken
AnswerID: 30634

Reply By: duncs - Friday, Sep 12, 2003 at 10:53

Friday, Sep 12, 2003 at 10:53
I'll throw my 2c in.

I had the same problem. Tried all the usual stuff plus king pin bearings. Turned out to be the panhard rod bushes.

If they are worn, and most of them are, it lets the whole front axle move from side to side. Feels sike it is about to fall out. Usually turning one way or the other will stop it for a short time. Next bump or turn or dab of the brake it comes back.

$50.00 at Pedders in Dubbo had me riding smooth.

Good luck
Duncs
AnswerID: 30860

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