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Car Forum / Jeep / April 2005

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TJ Caster adjustment

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Dennis Cox - 04 Apr 2005 16:58 GMT
I have searched the web for any sites out there that detail how to adjust
caster on a lifted TJ.  But no luck so far.  Does anyone have a good site or
can you briefly 'splain it to me?  After lifting the TJ and getting an
alignment, it still wanders all over the road indicating negative caster (or
is it positive).  I believe that I can adjust the lower control arms to be
longer to correct this, but how much?  I adjusted them to the same length as
the stock control arms and obviously that is not correct.  Also, what is the
trick to getting the upper bolt hole to line up in the lower control arm?
That one was a beotch last time I installed them.

Also, is it safe or recommended to remove the control arms with the Jeep
sitting on all 4 wheels?

Thanks,
Dennis
Steve - 04 Apr 2005 22:02 GMT
Put the the axle on stands and measure the caster by placing an angle
finder on the bottom of the inner knuckle. Increase the length of your
LCAs in small increments until the the knuckle is 3-6 degrees. This tips
the pinion down, so only set as much positive caster as you need to
regain steering control.

Steve
http://xjeep.dyndns.org

> I have searched the web for any sites out there that detail how to adjust
> caster on a lifted TJ.  But no luck so far.  Does anyone have a good site or
[quoted text clipped - 3 lines]
> longer to correct this, but how much?  I adjusted them to the same length as
> the stock control arms and obviously that is not correct.
Dennis Cox - 04 Apr 2005 22:12 GMT
thanks, I'll try that.  You state to put the axle on stands, does it help to
have the frame supported as well?  Are there any tricks to getting the LCA's
reinstalled after each adjustment?  They were a pita to install the first
time.  Very tough to line up those upper bolt holes.

Thanks,
Dennis

> Put the the axle on stands and measure the caster by placing an angle
> finder on the bottom of the inner knuckle. Increase the length of your
[quoted text clipped - 12 lines]
>> to be longer to correct this, but how much?  I adjusted them to the same
>> length as the stock control arms and obviously that is not correct.
Steve - 04 Apr 2005 22:43 GMT
Can't you leave the upper bolt connected and turn the lower half to
adjust? Either way, support the frame.

Another way to measure relative caster without getting inside the
knuckles is to put the angle finder on the flat surface that the front
diff cover mounts to. Do this on a flat surface while the vehicle is
unsupported.

Steve
http://xjeep.dyndns.org

> thanks, I'll try that.  You state to put the axle on stands, does it help to
> have the frame supported as well?  Are there any tricks to getting the LCA's
[quoted text clipped - 20 lines]
>>>to be longer to correct this, but how much?  I adjusted them to the same
>>>length as the stock control arms and obviously that is not correct.
Dennis Cox - 05 Apr 2005 01:56 GMT
The lower bolt is one of those whachamacallit bolts.  It was a pain to
reinstall it the first time I installed these LCA's.  The upper bolt was
easier than the lower is why I was thinking I would unbolt it.  Then I could
twist the LCA to lengthen it and reinstall the upper bolt and recheck angle
again.

If I'm way off on my ideas here, please tell me.  I'm not extremely
mechanically inclined, although I can follow directions most of the time. :)

Thanks,
Dennis
> Can't you leave the upper bolt connected and turn the lower half to
> adjust? Either way, support the frame.
[quoted text clipped - 31 lines]
>>>>adjusted them to the same length as the stock control arms and obviously
>>>>that is not correct.
Dennis Cox - 05 Apr 2005 21:03 GMT
ok, I adjusted the eccentric bolt on the lower control arm and got enough
adjustment out of it to make the steering "feel" better.  When I get some
time, I'll adjust the LCA longer so I can move the eccentric back to center.

Thanks for all of your advice.
Dennis
> The lower bolt is one of those whachamacallit bolts.  It was a pain to
> reinstall it the first time I installed these LCA's.  The upper bolt was
[quoted text clipped - 45 lines]
>>>>>adjusted them to the same length as the stock control arms and
>>>>>obviously that is not correct.
L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III - 05 Apr 2005 22:02 GMT
Hi Dennis,
    It's always going to be a compromise until you re-weld them, maybe
switch to Real hubs, and bearings at the same time:
http://77cj.littlekeylime.com/Mr.N44.htm or
http://www.trailhed.com/d44.html
       God Bless America, ßill O|||||||O
mailto:LWHughes3rd@aol.com http://www.billhughes.com/

> ok, I adjusted the eccentric bolt on the lower control arm and got enough
> adjustment out of it to make the steering "feel" better.  When I get some
> time, I'll adjust the LCA longer so I can move the eccentric back to center.
>
> Thanks for all of your advice.
> Dennis
Dennis Cox - 05 Apr 2005 22:25 GMT
pardon my ignorance Bill, but huh?  Is this one of your "real jeep" cracks?
:)

> Hi Dennis,
>     It's always going to be a compromise until you re-weld them, maybe
[quoted text clipped - 11 lines]
>> Thanks for all of your advice.
>> Dennis
L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III - 05 Apr 2005 22:37 GMT
    Just a suggestion, and only if you want to play with the big boys:
http://www.billhughes.com/pismo.htm
       God Bless America, ßill O|||||||O
mailto:LWHughes3rd@aol.com

> pardon my ignorance Bill, but huh?  Is this one of your "real jeep" cracks?
> :)
Paul Keating - 06 Apr 2005 02:17 GMT
When you're finished with the adjusting, get a buddy with a welder to
tack weld the eccentric cams in place....they have a habit of coming
loose at the worse possible time.

Paul

> ok, I adjusted the eccentric bolt on the lower control arm and got enough
> adjustment out of it to make the steering "feel" better.  When I get some
> time, I'll adjust the LCA longer so I can move the eccentric back to center.
mic canic - 06 Apr 2005 02:45 GMT
take it bac were they did the alignment
tell them it it pulls not drift they will blame the tires, unless of course you
rotate the tires before you go bac then have them explain thier actions

> The lower bolt is one of those whachamacallit bolts.  It was a pain to
> reinstall it the first time I installed these LCA's.  The upper bolt was
[quoted text clipped - 42 lines]
> >>>>adjusted them to the same length as the stock control arms and obviously
> >>>>that is not correct.
Paul Keating - 06 Apr 2005 02:15 GMT
> thanks, I'll try that.  You state to put the axle on stands, does it help to
> have the frame supported as well?  

If you don't, the Jeep will fall on the ground. ;o)

> Are there any tricks to getting the LCA's
> reinstalled after each adjustment?

Make sure both sides are adjusted the same, so you aren't twisting the
housing.....then push them into place with a bottle jack undere the
pumpkin snout.

Paul
 
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