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GQ Front Diff Shaking

Posted: Wed Aug 20, 2003 6:53 pm
by O'Doyle
I Recently snapped my rear left trailing arm and have run into a few problems. I have got a 5" lift and 2" body with castor plates. The diff was wandering enough for a 35" claw to rip out my guard. After replacing the trailing arm I began to get a big shudder/shaking coming from the front end. This resulted in me crawling home at 20km/h.
I took it to South Coast 4WD and they checked it all over and come up finding the swivel bearings were out of alignment, and need to be replaced in the near future, and that I get a return to centre stabilizer.
It seemed to get rid of the problem except for when i drove over a certain rough style of road the shaking would come again just a fraction, but has been getting worse. It seems to happen at around 50-70km/h and makes me have to pull over and stop or slow right down.
Does this sound like it could be the swivel bearings? :?: ?

Posted: Wed Aug 20, 2003 7:25 pm
by big red
mine used to do it with the shocks set on soft but was ok when set to 3 [rancho's] so maybe your shocks are stuffed.
I now have drop brackets and no more wobbles...ever.
shane

Posted: Wed Aug 20, 2003 7:55 pm
by ozy1
i used to get that problem, my radius arm bushes were shot, its been gone for a few months now, and im gettin it back again, i will sus mine out.

Posted: Wed Aug 20, 2003 10:04 pm
by blu125
Check the bushes in the leading arms. If the crush tubes break away from the rubber, "head shake" is common. Neoprene is not the answer - use genuine. It seems that usually it is the rear bush that fails first. Not hard to check by dropping each arm in turn, although it takes a bit of time. We ALWAYS replace the rubbers on the chassis mounts as well. I find it difficult to understand how aftermarket manufacturers keep selling off set neoprene bushes for castor correction when these bushes appear to be the source of so much of "the traditional Nissan 80/90kph vibrations".

Posted: Wed Aug 20, 2003 10:54 pm
by moose
"they" informed you to fit a steering stabiliser !!!!!
has this been done ?????

good chance , if you havent done it , DO IT !!!!!! :D

also the other posts are a good checking point !!!
( not just swivel bearings , check wheel bearings as well !!!)

Posted: Thu Aug 21, 2003 2:19 am
by Gabriel
Hmmmm, my LWB, on the way coming back from holliday start to do exactely the same ...thing...good idea to check the bushes..

Thanks, Gabriel

Posted: Thu Aug 21, 2003 7:45 am
by Wendle
check panhard bushes first, then everything else that everyone has said already. steering damper won't help much as it is only about 5mm oflateral movement at its worse. feels like much, much more because of the steering box ratio.
:)

Posted: Thu Aug 21, 2003 8:18 am
by JK
If your panhard is adjustable type, make sure that the lock nut is tight. I have found that if the locknut is loose, the 1mm or so of play in the thread not only makes nasty sounds but translates to a lot of front end slop. Loctite is your friend here.

Posted: Thu Aug 21, 2003 3:49 pm
by Steven
I had a similar problem with mine. it started when i put on 37" claws.

I saw several "experts" but without any luck. Finally one bloke checked it out for me and discovered that the castor plates that had been installed actually gave it 7 degrees of positive castor, instead of the 1 or 2 they should have.

Get that checked out on yours too if you dont have any luck.
Narellan Truck align found this on mine.

Good luck

Posted: Thu Aug 21, 2003 4:01 pm
by Wendle
Steven wrote:I had a similar problem with mine. it started when i put on 37" claws.

I saw several "experts" but without any luck. Finally one bloke checked it out for me and discovered that the castor plates that had been installed actually gave it 7 degrees of positive castor, instead of the 1 or 2 they should have.

Get that checked out on yours too if you dont have any luck.
Narellan Truck align found this on mine.

Good luck


yeah, castor between 1-3deg + is a good start :cool:

Posted: Thu Aug 21, 2003 7:36 pm
by Area54
Some good tech here on this thread:

http://www.outerlimits4x4.com/PHP_Modul ... php?t=5573