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#1 08-31-2011 08:47:21

nads
Rookie
Registered: 05-29-2009
Posts: 89

steering/suspension

yesterday I managed to wrangle on the new Bilsteins - (5100s??)
anyhow...the ones for a 3" lift... it drives much better now :-)

But...I still have a few niggles to sort out. One, I think I need a
spacer or something to correct my driveline angles from the lift. Where
can I get those? I believe you shim the transfer case??

Secondly, I have a clunking from the front end...I think it's worn
bushings, but I've not crawled underneath to investigate hard core. I
thought it was the shocks - as the rubber isolators at the top were
non-existent after my 60mph run down the hill at Spring Fling when the
accident occurred...I'm sure a few of you recall... so I had attributed
the noise to that...

But now, I'm pretty certain I must have spelled the demise of the upper
and lower control arms as well...and...if I need to rebush those..i'm
very tempted to look at upgrades...is this advised? I'm thinking about
replacing the lowers with non-OEM and leaving the uppers OEM, but
replace them so they have new bushings.

Lastly, I've still got a bit of a steering shimmy around 55-60...but i'm
now wondering if that's not bushing related as much as anything else...

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08-31-2011 08:47:21

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Re: steering/suspension

#2 09-26-2011 09:12:33

bryan
Rookie
Registered: 10-05-2008
Posts: 51

Re: steering/suspension

You can get driveline vibes if the angles are goofy or the slip yoke has extended so far out that it is woobley.

If you lifted your rear by using shackles that would tend to cause the pinion to rotate up, you can correct for this by installing tapered shims on top of the axle putting the wide end of the taper in front would rotate the pinion back to normal.

a transfer case drop kit installs between the cross member and the frame. So if the t-case was parallel with the ground before it will be pointing down to the rear and up in the front.

There are many things that can cause front end shimmy/ noise , a bad u-joint, a worn out tie-rod end on the track bar, the axle mounting hole for the same, swaybar links hitting on the front coils.

There are adjustable track bars to move the front axle back to center at your new higher ride hight. I found that at 2.5 - 3" the one I bought could not be adjusted short enough to work.
Some redrill the axle mounting hole, or do nothing at all.

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#3 09-26-2011 09:41:42

nads
Rookie
Registered: 05-29-2009
Posts: 89

Re: steering/suspension

I'll get some new (stock) upper and lower control arms installed, and
I'm due to replace all U-joints, then build the spacers for the transfer
case and get those installed.

My steering shimmy started at the same time I had the lift done...and
had it aligned...I'm wondering if my alignment isn't just a little out,
combined with the lift and worn bushings to create a wobble. No
worries, I'll get it all sorted soon enough.

I'll do everything one at a time so that I can pinpoint where the issue
is coming from.

Thanks!

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#4 09-26-2011 09:43:01

sucram
Rookie
Registered: 02-20-2010
Posts: 99

Re: steering/suspension

Unless you did the alignment yourself, I bet they did not shim the lower control arm forward at the frame bracket like you are supposed too. Can you see a shim and where the main bolt has moved forward in the slot in the frame bracket? That is the way you need to adjust the caster after a lift as you loose some and makes the Jeep wander a bit more and the return to center on the steering wheel is less as well. I would leave the dropping of the transfercase until last in case you don't need it and the problems are coming from some where else.

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09-26-2011 09:43:01

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Re: steering/suspension

#5 09-26-2011 19:28:08

james
Rookie
Registered: 10-05-2008
Posts: 90

Re: steering/suspension

I was just going to suggest the same thing when I read his last post.
Most general repair shops have no idea how to align a modified vehicle,
whether its a lifted truck, lowered car, or even just different wheels &
tires sometimes. Lifting a front leaf spring vehicle doesn't alter the
steering/axle geometry nearly as much as lifting a coil spring/control
arm setup like the XJ and full size Dodges use.

For the shake...do you feel it more in the rear of your vehicle...kind
of feeling it more with your butt than anywhere else, or is it mostly in
the steering wheel? Rear driveshaft angles will cause you to feel it
from the rear of the vehicle, where front driveshaft angles or steering
geometry being out will transfer through the steering wheel. If the
caster angle is out, you could get either death wobble (rapid shaking of
the steering wheel) or high speed vibes, if the driveshaft angles are out.

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#6 09-26-2011 19:55:36

nads
Rookie
Registered: 05-29-2009
Posts: 89

Re: steering/suspension

Yeah...i have a feeling the shop has messed up the alignment...but...I
also have some clunks that weren't present prior to Spring Fling...and I
think I know what those are from *devilish smirk*

I've got two feelings, independent of one another. The first is a
shimmy, starting around 52mph, and leaving around 58mph. This has got
to be due to the alignment/worn bushings. It was not present prior to
the lift, and can only be felt in the steering wheel. Annoying, but,
just drive faster or slower... No death wobble anywhere. I'm afraid
I'm intimately familiar with the DW on my last cherokee...and this one
has never had DW.

The second feeling is a vibration. Experience tells me it's from the
lift, and driveshaft angles not being quite right. Not noticeable
really until you're above 50mph, and pronounced at highway speeds. Just
a high speed rumble/vibration that goes through the chassis. It's
originating rear of the transfer case, in one of those joints...hence my
speculation that I need to shim the TC down a bit to correct those
driveshaft angles, and get rid of it.

None of this is a big deal...and on the old Jeep, I would have ignored
all of it. But, this one is nice enough to drive every day, and I'd
like to be able to do so, and still have it behave as near stock as
possible.

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#7 09-26-2011 19:58:08

reblam
Enthusiast
Registered: 10-05-2008
Posts: 106

Re: steering/suspension

Kind of in the same thread.
When I first bought my 96 in stock trim I noticed it seemed to wander above 45 mph.
No tire wear or pull and it drove fine, I just had to pay a lot of attention to keeping it straight.
So, I pulled a shim from behind one of the lower control arms, traced it out onto 1/8" metal I had laying around and cut two out.
Put one in both sides with the original shims and the wander was gone.
Had slightly increased steering effort.

In short, I loved the improvement.
Never did take it to an alignment shop as I figured all I'd really changed was the caster.
Never wore tires uneven either.

I've wanted to try it in our 97, just haven't had the time or gumption.

That's the nice thing about live axles and shimmed caster. If you try a change and don't like it, Put it back the way it was or go the other way!

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