[tigerperth]

Hi

Got a 1990 SJ70 Sierra, replaced all shocks, u bolts, shackles, bushes and new 50mm lift leaf springs. Had to remove front sway bar as that didn't fit. Now car has a death wobble. Checked it all and all looks fine. Do I need to modify swaybar mounts and or steering?
I Read up a bit and thought 50mm lift fairly straight forward with no extras needed. Has anyone else had this issue?


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[henno]

tigerperth wrote:

Checked it all

Define "all".

If kingpins weren't part of that "all" then start there and work your way out again.

[tigerperth]

Was fine before lift, why now?


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[tigerperth]

Noticed there's no adjustment for straightening steering wheel either, adjustable link required..


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[tigerperth]

henno wrote:

tigerperth wrote:

Checked it all

Define "all".

If kingpins weren't part of that "all" then start there and work your way out again.

Is this a common issue? Was fine before lift now it's crazy.


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[Toomanycars]

Lengthen the sway bar end links and put them back on. It will make a big difference to stability.

[tigerperth]

Toomanycars wrote:

Lengthen the sway bar end links and put them back on. It will make a big difference to stability.

WAs wondering if having the sway bar off was an issue. Can you buy longer ones or just cut and extend the existing mounting brackets. Has anyone else had to do this? Any how to's


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[tigerperth]

I've ordered new front wheel bearings and swivel hub service kits. So hopefully that should solve the problem. Will lengthen the swaybar mounts to suit as well. Who sells affordable adjustable drag links to straighten wheel and steering box?

Cheers....


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[Gwagensteve]

Wheel is straightened by pulling it off and moving it on the spline. This is correct procedure. There are no adjustable drag links available from the aftermarket.

Don't bother with the swaybar. Stability isn't the issue, death wobble is the issue.

The change is likely due to reduction in caster because of the lift springs.

Yes, it's common. It's a sign that kingpins need service. They've probably never been touched in the life of the car. Use the factory service manual settings for knuckle starting torque.

Steve.

[tigerperth]

Cheers Steve.
Will be rebuilding the hubs and king pins during week. Where can I find the factory service manuals?

Isn't Moving the wheel on spline a cheat isn't it?
Steering box has a centre position with free play and even turns left and right. If you remove wheel and refit it will be in even in steering box. More turn right and less turn left, or vice versa?
Cheers..


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[Gwagensteve]

There is plenty of throw in the steering box for the task at hand. It's not a cheat. It's the correct way to centre the wheel position- there is no other way.

I don't have a link to the manuals, but there are some on here somewhere from memory.

[tigerperth]

No worries will, replace bearings and see how I go.


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[MrRocky]

Did u change all the bushes as well ?
Its worth giving it all a go over and nipping up all the bolts after a couple days driving to

[THE_DICTATOR]

Had the same happen to a Sierra a while ago, was caused by loose U bolts

[tigerperth]

All new shackles, u bolts, bushes
King pin bearings have been grabbing and wheel bearings are worn out. Was hardly any play, pays to pull apart.

Cheers for advice




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[sideways]

THE_DICTATOR wrote:

Had the same happen to a Sierra a while ago, was caused by loose U bolts

x2 on my landcruiser.

That bearing is pretty borked!