wobbling/porpoising/swaying after rough raod trip - Page 2 - Toyota Nation Forum : Toyota Car and Truck Forums
4Runner 3rd Generation (1996-2002) Discussion area for the third generation Toyota 4Runner.

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post #16 of 33 Old 03-21-2019, 03:07 PM
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Quote:
Originally Posted by Iamnotno6 View Post
lots of rust!!

mark
Have you carefully inspected the frame fer any rusted issues? There stands a good possibility that maybe the crossover beam(s) may be compromised and yer mechanic just isn't finding/seeing it?

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post #17 of 33 Old 03-27-2019, 08:26 AM Thread Starter
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wouldn't the alignment/steering be the same for summer/winter tires?
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post #18 of 33 Old 03-27-2019, 08:30 AM Thread Starter
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Quote:
Originally Posted by BamZipPow View Post
Have you carefully inspected the frame fer any rusted issues? There stands a good possibility that maybe the crossover beam(s) may be compromised and yer mechanic just isn't finding/seeing it?
we've both been over it with flashlights when up on the hoist
if they are compromised, we haven't seen it yet

the 1 thing I have noticed - with the winter tires if I try to rock it by pushing on the rear above the gas filler I get very little movement
when the summers were on, we could get quite a bit of movement - looked like it was all in the tires - that's when we swapped tires/rims and found the problem was virtually gone

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post #19 of 33 Old 04-04-2019, 07:51 AM Thread Starter
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can someone please explain how my suspension is supposed to work?
and what should be dampening this oscillation?
maybe if I know what isn't doing it's job, I can focus my attention there

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post #20 of 33 Old 04-04-2019, 12:53 PM Thread Starter
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I did find this
http://www.toyota-4runner.org/3rd-ge...ay-speeds.html

seems to be my problem

checked with my mechanic & he checked all the bushings...

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post #21 of 33 Old 04-05-2019, 08:00 PM
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So I guess it's the panhard bar's job to keep yer rear end stable? I'd remove it and inspect it all inch by inch very carefully just to make sure...especially the bushings. How did yer mechanic inspect the panhard bar bushings? Did he remove it to inspect them?
https://www.toyota-4runner.org/3rd-g...-question.html

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post #22 of 33 Old 04-06-2019, 05:47 AM Thread Starter
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no, just inspected on the hoist

he had the guys rock the truck while he watched - didn't see any movement

Last edited by Iamnotno6; 04-07-2019 at 06:22 AM.
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post #23 of 33 Old 04-08-2019, 01:26 AM
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Inspected it on the hoist? What kind of hoist was it on? How was the rear axle supported? If the rear axle droops while on the hoist, you will not be able to inspect the condition/geometry of the rear suspension in the same manner as if you were traveling down the road.

Do you have any sort of lift kit installed? If so, was the rear suspension geometry adjusted accordingly? Reading over the thread I linked above, there seems to be a lot of issues similar to what yer experiencing when the geometry is not correct. Snap some piccies of the rear sway bar and panhard bar and post them please.

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post #24 of 33 Old 04-08-2019, 01:42 AM
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Video on how the proper geometry of the panhard bar affects the rear axle sway.

1998 T-100 SR5 2WD auto, Roadmaster Active suspension, dual oil catch jars, AC mod, aero cap, lower aero package, 67% grill block, aero single wheel trailer
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post #25 of 33 Old 04-08-2019, 06:52 AM Thread Starter
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no lift - everything is stock
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post #26 of 33 Old 04-08-2019, 06:53 AM Thread Starter
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wouldn't let me post all 6 pics - here's the missing 1

looks like I got the passenger trailer arms pics labelled backwards
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Last edited by Iamnotno6; 04-08-2019 at 07:00 AM.
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post #27 of 33 Old 04-08-2019, 11:00 AM Thread Starter
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my mechanic is leery of the urethane bushings - squeaking
whiteline supplies grease to alleviate that
I have already sunk $3500 into this & some other problems since the rough road trip in Oct for my 1999
I am definitely looking for the cheapest solution to get rid of the wobble
not sure that replacing the panhard & trailing arm bushings will solve the problem, other bushings may be worn i.e. upper control arm

thoughts?

mark

Toyota replacement prices from mechanic:
lower arm bushings $77x4 (or replacement @$359 ea)
panhard $504
upper arm $282x2

I can get the panhard & lower control arm bushings for CDN$188

Last edited by Iamnotno6; 04-08-2019 at 11:53 AM.
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post #28 of 33 Old 04-09-2019, 01:59 AM
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Some of those trailing arm bushings are blown out and are toast. Are you sure yer mechanic inspected those? Those fasteners don't even look like they were touched. I have found that motor oil and transmission fluid will degrade those bushings over time. My rack and pinion rubber bushings were completely soft and degraded. I ended up modifying some universal polyurethane bushings to fit in my rack and pinion. Now I don't have to worry about those bushings failing at all.

If installed correctly and maintained, polyurethane bushings will usually outperform the OEM rubber bushings.

Completely replacing the control arms and the panhard bar might be a better choice as it's pretty simple if you have the basic tools to work with.

Lower arm replacement

Rock Auto has some aftermarket arms pretty cheap.
https://www.rockauto.com/en/catalog/...trol+arm,10401

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post #29 of 33 Old 04-09-2019, 08:05 AM Thread Starter
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thanks
ordered the 4 arms from rockauto
ordered bushings for the panhard bar
mechanic is getting new bolts
hopefully all this will fix the 'death' wobble

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post #30 of 33 Old 04-09-2019, 01:00 PM
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When you replace the parts, snap some piccies of the bushings. I'm curious how bad they are.

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