Outer Limits 4x4 Board

Ok so I dont know it I should post this here or in the toyota or gen tech section but its mostly a zook so here we go.
I have finly got the zook so far the its drivable on the road but ts gets a mad steering wheel shimmy so much that I have to stop the car.
my set up is 80 diffs and 80 series steering box (fitted with spacer tubes welded in the chassie) with 2" extended shackels (I know the bush are worn and think this my be my problem) and 37" tyres any one have any thoughts on what it could be. do other zooks with std diffs do this?

oh btw theres no steering dampner on it yet

jimbo

pic of set up

type in death wobbles in search as i was showed to do

it seems to be a real common thing with zooks,dampener might help but as people say only covers up the problem,i replaced the dampener with a big one on my zook,put new tyres on and got em balanced,tightened up steering box as its sloppy as,toed it in a bit,tried heaps of adjustments in and out and then i put a new front diff in that i put a swivel hub kit etc in,wheel bearings were loose as i pulled my old diff out,tight with new diff and it hasnt done it since so i put it down to my wheel bearings

how are yours?are your tyres balanced ,how quick were u going?mine used to do it at 60,then with new tyres and dampener was 30 but it used to be so bad id have to try pull over and id lock it up to a complete stop

maybe its them big ugly diffs and you should give them to me

try toeing in or out until it gets better.

It dose it mainly coming out of round abouts wheel bearing are good there new tyre's arent balanced but I dont think its tyre's can the springs walk on the worn bush's?

What's the castor set up as?

Mine does it with standard diffs. It mostly does it when accelerating off from lights or going over a bump at lowish speeds, doesnt seem to do it at higher speeds.

zookimal wrote:What's the castor set up as?

+1

Chech/change/tighten up your front end bearings, bushes etc. If it still does it check what your caster is set to. When you welded the perches on did you check/set caster to be approx standard 80 series? Get some standard tyres and rims (standard 80s haha) so you are testing on a good balanced tyre. Testing on unbalances 37's will be a struggle.

Layto....

lay80n wrote:

zookimal wrote:What's the castor set up as?

+1

Chech/change/tighten up your front end bearings, bushes etc. If it still does it check what your caster is set to. When you welded the perches on did you check/set caster to be approx standard 80 series? Get some standard tyres and rims (standard 80s haha) so you are testing on a good balanced tyre. Testing on unbalances 37's will be a struggle.

Layto....

I set the peachs up to to std caster for a 80 series but havent had it wheel aligned yet to check will try the 31's I have

If your bearings and steering box are tight and the castor's good i'd check your wheel alignment - if its toeing in even slightly with the larger tyres it will wobble its head off.

Toe it out just slightly (just a few mm) and see if that fixes it, with 40's on 12" rims i wound mine out to be about 5mm toe out and slowly wound it back closer to neutral.

I think I ended up running about 2mm toe out (at the rim) and it got rid of all my wobbles.....

on another note


u DROVE THAT ON THE ROAD??

was it under the cover of dark??? on a back road?

Youre shackles are on around the wrong way.

It's well known that death wobbles are terrible when the "S" is around the wrong way.

Sorry, couldn't resist that.

Definitely go through everything that comes up on a "death wobble" search. There's quite a few possible causes from what I can see of your setup but you will probably find it's a whole lot of little issues adding up/

Steve.

Gwagensteve wrote:Youre shackles are on around the wrong way.

It's well known that death wobbles are terrible when the "S" is around the wrong way.

Sorry, couldn't resist that.

Definitely go through everything that comes up on a "death wobble" search. There's quite a few possible causes from what I can see of your setup but you will probably find it's a whole lot of little issues adding up/

Steve.

no thats not a S its a Z for zook

will have to check the alingment

check your front disks are not warped.

Ridge wrote:check your front disks are not warped.

Death wobble is not brake related.

with me it was.
i checked wheel bearings, bushes, had an alignment and balance, but nothing changed.
then i checked the disks and one was warped. changed them both and no more problems.

x2

sticky front calliper caused me death wobbles,

sounds silly but jack it up and see if all the wheels actually turn as they should

nic

thanks for all the info guys

I tried all of the suggestions i could find and some of them seemed to help. but the most improvement came from king pin bearings, wheel bearings, and the one fix-up that really did the trick was the front shackle bushings.

have you got shims inside your kingpin bearings??

they're very good at causign wobbles as well... it may be that your shims are spacing the bearings out too far.

all sorted now was the wheel bearings loose on both sides thanks to all with all the great info

jimbo

pretty much what mine came down too too bad i done evrything else first

now thats sorted get it finished mate

Turbo Tonka wrote:pretty much what mine came down too too bad i done evrything else first

now thats sorted get it finished mate

its close I just have to beff up a transfer chassie mount & build my R/H rock slider and she's ready to test of road