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nissan
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Discussion Starter #1
Yeah I know, this topic has been covered in 1000000 other posts, ive read em all, dont worry. But heres my problem.
Have a 06 alloy tray back 4.2, leaf rear, had 80km front end shakes since ive owned it in one form or another.
Had a normal wheel balance and alignment, slight improvement for short time, no real change.
Had a 'force varience test' on all wheels where they match the tyres to the rims, slight change for short time, no real improvement.
Had an 'on car' balance, slight improvement, then after a day or two, back to shakes.
Tried spoke balancers and cone balancers.

Tossed original steering damper and replaced with new RTC, that seemed to make the shakes the worse they have ever been!

Finally got a set of 4x different wheels tyres to try, didnt change the shakes, so not the wheels!

Took out the swivel hub shims and tightened, put in 30mm spring spacers on front to try and 'reset' geometry. Tightened front wheel bearings. Another wheel balance and alignment, drove it down highway, hey its fixed, or so i thought, two days later back to shakes! WTF!

Had 100kg of cement bags in rear tray and finally the thing showed some sort of improvement in front shakes, decreased the most i'v eva noticed, still there but not nearly as bad.

Could there be something going on with the rear springs/ rear end causing front end shakes? Or is it just lifting the front up a little more than the 30mm spacers?

New panhard rod bushes on order, apparantly Nissan dont sell em seperately anymore!!!!?

Have checked the front end out as have various mechanics, all appears good with no obvious problems.

This thing is driving me mad..... Anyone know of any mechanic in Perth that can fix this b4 i drive it off a cliff!? Any other suggestions?? other than keep the cement in the rear..
Oh yeah - and suggestions like dont drive it btwn 80-90kms dont really help.:crazy:

Dunno if its suspension, steering, wheels or tyres so posted it here, (save repeating it )
(sorry for long winded rant) any good info would be appreciated.

ARGGGGGHHHHHHHHHHHHHHH !!!!:sad::confused::coffeeti: cheers
 

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Tie rod ends perhaps? I had this problem last year after replaced pan hard rod bushes, tie rod ends (brought 2 rock rods from snake racing because nissan decided they didnt want you to replace just the tie rod ends). Turned out to be swivel hubs, removed the shims and it was better.

Is it a death wobble like one that throws u off the road or one that is just more annoying whilst driving?
 

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nissan patrol
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Do you have raised suspension?? If you don't have any castor correction the front end will wobble about a fair bit. My old truck had a 4" lift without castor correction the whole car tracked all over the place, fitted some drop boxes and everything was sweet, or alternately check your radius arm bushes (both ends) for wear.
 

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NISSAN
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Just on the cement bag issue. Does the Truck still wobble at 80km or other when you are fully loaded on the back?
 

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nissan
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Discussion Starter #5
Hi Guys appreciate the quick replies, now thats service for u!

Patrolling, havnt done the tie rod ends, thats probly next after the panhard bushes?
Doesnt quite throw me off the road, but really really bad, like something is about to let go - bad. not like you would get with a wheel balance type of thing, If i speed up it does drive out of it after around 95kms
Got really really bad after fitting the rtc damper.

MickC, nah its standard suspension???! It was an ex western power ute so dunno if the rear leafs are heavier than normal? May have once carrried a bit of weight in its life? Yeah Radius arm bushes thats on the to do list too i guess.

GUBundy, with no weight on the rear it shakes like a [email protected]##&*rd, best improvement i have had is when its loaded, still a slight shake at around 80 but no where near as bad then when it is empty.

Weird thing is, before adding the cement bags, sometimes it wasnt too bad unloaded other times it was shocking - comes and goes?
 

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when u pulled the shims out of the swivel hubs did u check ur bearings and cups for any wear or damage?
 

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nissan
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Discussion Starter #7
Yes mate, bearings and cups looked fine. in fact everything looked pretty good under there.
 

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nissan
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G'day, get rid of the return to centre, they amplify the problem imo. the harder it pushes into the left spring the harder the left spring on the steering dampener pushes it into the right side , and its like arguing with the mil , it just escalates!

Panhards, and radius arm bushs , and get your caster checked out , you may be able to use castor correction radius arm bushes.
 

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Discussion Starter #9
Hi Fishmagnet, yeah was thinking that may be best and plan to ditch the RTC as that did make it worse. Heres me hoping it would help fix it, (haha) was thinking of going with a standard OME damper or similar. - Any thoughts on which damper? and yeah panhards are next then radius arm bushes, me thinks the caster was checked after the 30mm spacers were put in. cheers
 

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The nutty professor
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i have a different one for ya, how about a rear end shake , steering on mine is fine but the arse end gets wobble up at around 90 plus , can see the gear sticks going side to side
 

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Discussion Starter #11
Hmmmm, front end shakes - rear end shakes, i dunno. like a wet dog in a cold place.:rolleyes:
mine is thru the steering wheel not thru tha drivers seat?? was wondering if a shakey rear leads to a shakey front... on the truck that is.
 

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NISSAN
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Hi Guys appreciate the quick replies, now thats service for u!


GUBundy, with no weight on the rear it shakes like a [email protected]##&*rd, best improvement i have had is when its loaded, still a slight shake at around 80 but no where near as bad then when it is empty.

Weird thing is, before adding the cement bags, sometimes it wasn't too bad unloaded other times it was shocking - comes and goes?
Ok... now I am confident IMO the issue is the weight distribution of the vehicles load over different road surfaces!

By this I mean when loaded up the rear leafs are actually holding the troll's weight evenly across, from front to rear and flexing ( springing) up and down. I suspect the rear leaf springs are Heavy Duty( very stiff) and when not loaded up are lilerally like being on a solid Chassy.

This would cause the vehicles weight and balance distributions to be right out of whack.

Your front springs are already under load given the engine is there and moving to suit the road conditions but the back is simply bouncing and or skipping. This will cause death wobbles and significant vibrations through the troll, more noticeable on the front steer

I am not a mechanic or suspension specialist by the way. Just been around the block a few times.

I have seen this happen to many of my mates work Utes. When they are loaded up and or towing they ride awesome. Take that all away and they misbehave real bad like a kid having a tantrum.

If you can get a set of second hand leafs to try out or even old ones from the wreckers I would give that a go before buying more expensive stuff.

ALso you can over load the **** out of the rear to lift the weight of the front wheels and see what effect that may have. It can also make the troll drift left or right from the front( I didnt do this so I dont know how I thought of it:crazy:) this is further amplified at speed and comes and goes.

I also think your RTC is just doing what any dampener would do. Even if you change back I don't think that would make a difference. The RTC is most likely alot stiffer than the OEM and yes that would amplify the problem, but it's not the problem if you get what I mean.
Hope this helps and make some sense. Fingers where typing slower than the brain was ticking
 

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Discussion Starter #14
Cheers GU Bundy for the considered response.
I was kinda wondering about the rear leafs myself, they do seem to be heavier duty than others i have seen, so maybe the power co that owned it B4 had them installed for the extra weight it probly wudda been carrying back then, coupled with the light weight alloy tray - and now I own it theres nothing in the back to keep it down so to speak, so what u r saying does make some sense.
She does ride pretty hard with no load - back aching stuff!- even for a leaf rear end.!

(even tho the so called experts dont think a rear end problem would be causing it - but in saying that they do concede the front end suspension components look good and cant seem to find a problem.)!!

It wud also explain why the cement bags is having an effect - i think I WILL try some different springs in the rear, shud pick up some std ones cheap enuff. Thanks again.
 

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Discussion Starter #16
Hmm now theres a thought too Nutty Professor ! -the power of collective heads on my problem, taking a closer look one of the leaves does look like its not in line with the top ones,,, wonder if that makes a difference?
 

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Cheers GU Bundy for the considered response.

the power co that owned it B4 had them installed for the extra weight it probly wudda been carrying back then,

She does ride pretty hard with no load - back aching stuff!- even for a leaf rear end.!
These two point you make crystallize the issue for me in my head.

Power companies carry a **** load of equipment and heavy cable and most of the time have big tool boxes, compressors and other tools to be self sufficient when out in remote sites.

And the back aching stuff.... Well hell yeah! This all point to an over compensated rear end.
At least the softer rear srings wont put your back out... if you are going to add a canopy or other stuff to the rear latter I would also keep the leafs you currently have just incase you load it up on a more permanent basis.

I hope you solve the problem, it can be really frustrating and removes all the enjoyment of trolling along.
 

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Discussion Starter #18
Yes I think U may be onto something GU Bundy. Well certainly worth a try as iv (almost) tried evrything else but havnt tackled the rear end.) And u r certainly right about the weight they would b carrying, ive seen there current rucks loaded up with half the power station.

I will give it a whirl, I really like the truck and u r right these things do get to ya. Im one that doesnt like squeaks, rattles or shakes , after all it must be sumthing causing it. must be my OCD haha.

and yeah thats part reason why i keep a full belly of fuel in her , helps with the ride (and my back!)
 

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Hi, probably a silly question - seeing that you have covered most bases - but for a comparison, have you tried inflating the tyres to their maximum allowable pressure as indicated on the side wall and taken it for a run.

Possible you have a situation where the flex in the crown of the tyre from centrifugal force at 80 kph is such that a form of 'tram tracking' effect is being set up. In other words the tyre's shape (crown and sidewall), at this speed, is dictating what is happening. Drive thru it (higher speed) the shape of the crown of the tyre changes and the wobbles dissappear.

For interest, what's your tyres ply ratings.... have seen wobbles like this sorted by fitting higher ply rated tyres..

My 2 bobs worth
 
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