Definitely check out the trac bar ------- as well as the track bar
mount.

This particular suspension (forward 'lead' of control arms) is
'naturally' unstable for vibrations and unless the trac bar, trac mount
and steering damper are 100% correct you will get 'nodes' of
vibration.at various driving speeds. The trac bar (and damper) prevents
these natural oscilations from occurring; the damper is there for
'transient' vibrations caused by 'bumps in the road' etc. the trac bar
there to prevent 'natural frequency oscilation'. The symptoms of
vibrational instability will be found by carefully examining for
adverse wear patterns on the road surface edge of the inside of the
inner tire tread margins.

Check the inside margin of the tires (the inside tread).... lightly rub
your hand along this margin and feel for uneveness and irregular wear
patterns on the surface (only on the 'inside' tread). If you find them
do the following test: Engine off, steering wheel centered - turn
steering wheel 180 degrees back and forth, sight down hood at far
distant object ..... and if the body is 'moving' with respect to a far
distant object when you rotate the steering wheel back and forth then
you probably have something loose in the trac bar or its mounting on
the frame. If the body moves have an assistant rotate the wheel while
you are under the vehicle and look for the sites of looseness on the
trac bar and mount.

For the trac bar *mount* on the frame - ... be *sure* that all the
bolts are fully torqued especially the ones that attach the bottom
flange of the mount to the frame --- then test for movement between the
trac bar itself and the mount. If any of the mounting part are loose,
use RED locktite to reassemble and re-torque. The mount is very
subject to wear (ductile deformation) in the hole that accepts the
pin/spindle of the trac bar .... only a few 'thousands' of 'play' in
the 'hole' of the mount will magnify to a LOT of vibration when the
steering components reach their "natural frequency" of oscilation. If
the bottom flange bolts of the mount are loose, the vibrations when
they occur will be greatly MAGNIFIED.

Check the inner tread on the tires !!!!!!!!!!!!!!!! any 'waviness' of
the (road) surface of the 'inside' tread indicates a loose trac bar /
trac bar mount. The waviness on the inner tread margin is caused by
induced 'natural frequency vibrations' the same thing that makes a
violin string vibrate - the suspension is the violin string, the road
surface is the 'bow'. A dead tight trac bar system will keep this from
happening.

Hope this helps.



In article <41C5902E.15AEBB94@sympatico.ca>, Mike Romain
<romainm@sympatico.ca> wrote:

> At that age I would be checking the track bar close. That is a bar that
> goes on a diagonal from the passenger side axle up to the drivers side
> frame in the front. It wears out in 2 places. The bushings at the axle
> and the ball joint at the frame. If you have someone cut the tires side
> to side while you watch it, you can see play in the bushings and
> movement in the ball joint if either is bad.
>
> Your steering has a shock or stabilizer on it to slow down vibes, it
> could be worn out. 'Usually' you can see signs of leaks when worn out.
>
> The rad fan can also make a really strange vibration when it is worn
> out. Bad enough I thought I was going to lose a front wheel when ours
> went.
>
> If you are in the neighborhood, drop on by Herb, maybe we can spot
> something here.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
> >
> > 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the speed,
> > the higher frequency the vibration is. Get tires balanced,vibration still
> > there. I jacked up front end, no joints found to be loose.
> >
> > Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or the
> > hub?
> >
> > Any advice on how to find out the problem?
> >
> > thanks
> >
> >

 

Definitely check out the trac bar ------- as well as the track bar
mount.

This particular suspension (forward 'lead' of control arms) is
'naturally' unstable for vibrations and unless the trac bar, trac mount
and steering damper are 100% correct you will get 'nodes' of
vibration.at various driving speeds. The trac bar (and damper) prevents
these natural oscilations from occurring; the damper is there for
'transient' vibrations caused by 'bumps in the road' etc. the trac bar
there to prevent 'natural frequency oscilation'. The symptoms of
vibrational instability will be found by carefully examining for
adverse wear patterns on the road surface edge of the inside of the
inner tire tread margins.

Check the inside margin of the tires (the inside tread).... lightly rub
your hand along this margin and feel for uneveness and irregular wear
patterns on the surface (only on the 'inside' tread). If you find them
do the following test: Engine off, steering wheel centered - turn
steering wheel 180 degrees back and forth, sight down hood at far
distant object ..... and if the body is 'moving' with respect to a far
distant object when you rotate the steering wheel back and forth then
you probably have something loose in the trac bar or its mounting on
the frame. If the body moves have an assistant rotate the wheel while
you are under the vehicle and look for the sites of looseness on the
trac bar and mount.

For the trac bar *mount* on the frame - ... be *sure* that all the
bolts are fully torqued especially the ones that attach the bottom
flange of the mount to the frame --- then test for movement between the
trac bar itself and the mount. If any of the mounting part are loose,
use RED locktite to reassemble and re-torque. The mount is very
subject to wear (ductile deformation) in the hole that accepts the
pin/spindle of the trac bar .... only a few 'thousands' of 'play' in
the 'hole' of the mount will magnify to a LOT of vibration when the
steering components reach their "natural frequency" of oscilation. If
the bottom flange bolts of the mount are loose, the vibrations when
they occur will be greatly MAGNIFIED.

Check the inner tread on the tires !!!!!!!!!!!!!!!! any 'waviness' of
the (road) surface of the 'inside' tread indicates a loose trac bar /
trac bar mount. The waviness on the inner tread margin is caused by
induced 'natural frequency vibrations' the same thing that makes a
violin string vibrate - the suspension is the violin string, the road
surface is the 'bow'. A dead tight trac bar system will keep this from
happening.

Hope this helps.



In article <41C5902E.15AEBB94@sympatico.ca>, Mike Romain
<romainm@sympatico.ca> wrote:

> At that age I would be checking the track bar close. That is a bar that
> goes on a diagonal from the passenger side axle up to the drivers side
> frame in the front. It wears out in 2 places. The bushings at the axle
> and the ball joint at the frame. If you have someone cut the tires side
> to side while you watch it, you can see play in the bushings and
> movement in the ball joint if either is bad.
>
> Your steering has a shock or stabilizer on it to slow down vibes, it
> could be worn out. 'Usually' you can see signs of leaks when worn out.
>
> The rad fan can also make a really strange vibration when it is worn
> out. Bad enough I thought I was going to lose a front wheel when ours
> went.
>
> If you are in the neighborhood, drop on by Herb, maybe we can spot
> something here.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
> >
> > 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the speed,
> > the higher frequency the vibration is. Get tires balanced,vibration still
> > there. I jacked up front end, no joints found to be loose.
> >
> > Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or the
> > hub?
> >
> > Any advice on how to find out the problem?
> >
> > thanks
> >
> >

 

thank you so much for the input.
I did check the track bar. When I turned the steering wheel all the way from
stop to stop, the front end moved from left to right obviously. The ball
joint at the frame(the joint at driver side)moved slightly up and down.

I also checked the inside tread of the front tires, didn't find irregular
wear pattern.

Any advice how to tight the ball joint or replace it, what's the cost.

Thank you in advance.
"Herb" <haizhong_email@yahoo.com> wrote in message
news:Dt8xd.23261$pb.1555226@news20.bellglobal.com. ..
> 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the
> speed, the higher frequency the vibration is. Get tires balanced,vibration
> still there. I jacked up front end, no joints found to be loose.
>
> Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or
> the hub?
>
> Any advice on how to find out the problem?
>
> thanks
>
>
>
>
>

 

thank you so much for the input.
I did check the track bar. When I turned the steering wheel all the way from
stop to stop, the front end moved from left to right obviously. The ball
joint at the frame(the joint at driver side)moved slightly up and down.

I also checked the inside tread of the front tires, didn't find irregular
wear pattern.

Any advice how to tight the ball joint or replace it, what's the cost.

Thank you in advance.
"Herb" <haizhong_email@yahoo.com> wrote in message
news:Dt8xd.23261$pb.1555226@news20.bellglobal.com. ..
> 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the
> speed, the higher frequency the vibration is. Get tires balanced,vibration
> still there. I jacked up front end, no joints found to be loose.
>
> Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or
> the hub?
>
> Any advice on how to find out the problem?
>
> thanks
>
>
>
>
>

 

thank you so much for the input.
I did check the track bar. When I turned the steering wheel all the way from
stop to stop, the front end moved from left to right obviously. The ball
joint at the frame(the joint at driver side)moved slightly up and down.

I also checked the inside tread of the front tires, didn't find irregular
wear pattern.

Any advice how to tight the ball joint or replace it, what's the cost.

Thank you in advance.
"Herb" <haizhong_email@yahoo.com> wrote in message
news:Dt8xd.23261$pb.1555226@news20.bellglobal.com. ..
> 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the
> speed, the higher frequency the vibration is. Get tires balanced,vibration
> still there. I jacked up front end, no joints found to be loose.
>
> Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or
> the hub?
>
> Any advice on how to find out the problem?
>
> thanks
>
>
>
>
>

 

There you go Herb, visible up and down movement is way more than enough
to give you the shakes.

They are expensive buggers! You have to buy the whole arm. I think
these guys might have the best price on them, cheaper than Canadian Tire
if I remember right. They also put mine on for a good price. They can
be a real pain to change. They had to torch mine off!
http://www.ontariorv.com/

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Herb wrote:
>
> thank you so much for the input.
> I did check the track bar. When I turned the steering wheel all the way from
> stop to stop, the front end moved from left to right obviously. The ball
> joint at the frame(the joint at driver side)moved slightly up and down.
>
> I also checked the inside tread of the front tires, didn't find irregular
> wear pattern.
>
> Any advice how to tight the ball joint or replace it, what's the cost.
>
> Thank you in advance.
> "Herb" <haizhong_email@yahoo.com> wrote in message
> news:Dt8xd.23261$pb.1555226@news20.bellglobal.com. ..
> > 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the
> > speed, the higher frequency the vibration is. Get tires balanced,vibration
> > still there. I jacked up front end, no joints found to be loose.
> >
> > Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or
> > the hub?
> >
> > Any advice on how to find out the problem?
> >
> > thanks
> >
> >
> >
> >
> >

 

There you go Herb, visible up and down movement is way more than enough
to give you the shakes.

They are expensive buggers! You have to buy the whole arm. I think
these guys might have the best price on them, cheaper than Canadian Tire
if I remember right. They also put mine on for a good price. They can
be a real pain to change. They had to torch mine off!
http://www.ontariorv.com/

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Herb wrote:
>
> thank you so much for the input.
> I did check the track bar. When I turned the steering wheel all the way from
> stop to stop, the front end moved from left to right obviously. The ball
> joint at the frame(the joint at driver side)moved slightly up and down.
>
> I also checked the inside tread of the front tires, didn't find irregular
> wear pattern.
>
> Any advice how to tight the ball joint or replace it, what's the cost.
>
> Thank you in advance.
> "Herb" <haizhong_email@yahoo.com> wrote in message
> news:Dt8xd.23261$pb.1555226@news20.bellglobal.com. ..
> > 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the
> > speed, the higher frequency the vibration is. Get tires balanced,vibration
> > still there. I jacked up front end, no joints found to be loose.
> >
> > Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or
> > the hub?
> >
> > Any advice on how to find out the problem?
> >
> > thanks
> >
> >
> >
> >
> >

 

There you go Herb, visible up and down movement is way more than enough
to give you the shakes.

They are expensive buggers! You have to buy the whole arm. I think
these guys might have the best price on them, cheaper than Canadian Tire
if I remember right. They also put mine on for a good price. They can
be a real pain to change. They had to torch mine off!
http://www.ontariorv.com/

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Herb wrote:
>
> thank you so much for the input.
> I did check the track bar. When I turned the steering wheel all the way from
> stop to stop, the front end moved from left to right obviously. The ball
> joint at the frame(the joint at driver side)moved slightly up and down.
>
> I also checked the inside tread of the front tires, didn't find irregular
> wear pattern.
>
> Any advice how to tight the ball joint or replace it, what's the cost.
>
> Thank you in advance.
> "Herb" <haizhong_email@yahoo.com> wrote in message
> news:Dt8xd.23261$pb.1555226@news20.bellglobal.com. ..
> > 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the
> > speed, the higher frequency the vibration is. Get tires balanced,vibration
> > still there. I jacked up front end, no joints found to be loose.
> >
> > Tire is Roughrider from Canadian Tire. I figure it might be bad tire? or
> > the hub?
> >
> > Any advice on how to find out the problem?
> >
> > thanks
> >
> >
> >
> >
> >

 

thanks Mike. How much roughly? If leave it as is, how bad it will be , I
mean is it safe?

Herb
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:41C5FCA7.E6D1ECBC@sympatico.ca...
> There you go Herb, visible up and down movement is way more than enough
> to give you the shakes.
>
> They are expensive buggers! You have to buy the whole arm. I think
> these guys might have the best price on them, cheaper than Canadian Tire
> if I remember right. They also put mine on for a good price. They can
> be a real pain to change. They had to torch mine off!
> http://www.ontariorv.com/
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
>>
>> thank you so much for the input.
>> I did check the track bar. When I turned the steering wheel all the way
>> from
>> stop to stop, the front end moved from left to right obviously. The ball
>> joint at the frame(the joint at driver side)moved slightly up and down.
>>
>> I also checked the inside tread of the front tires, didn't find irregular
>> wear pattern.
>>
>> Any advice how to tight the ball joint or replace it, what's the cost.
>>
>> Thank you in advance.
>> "Herb" <haizhong_email@yahoo.com> wrote in message
>> news:Dt8xd.23261$pb.1555226@news20.bellglobal.com. ..
>> > 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the
>> > speed, the higher frequency the vibration is. Get tires
>> > balanced,vibration
>> > still there. I jacked up front end, no joints found to be loose.
>> >
>> > Tire is Roughrider from Canadian Tire. I figure it might be bad tire?
>> > or
>> > the hub?
>> >
>> > Any advice on how to find out the problem?
>> >
>> > thanks
>> >
>> >
>> >
>> >
>> >

 

thanks Mike. How much roughly? If leave it as is, how bad it will be , I
mean is it safe?

Herb
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:41C5FCA7.E6D1ECBC@sympatico.ca...
> There you go Herb, visible up and down movement is way more than enough
> to give you the shakes.
>
> They are expensive buggers! You have to buy the whole arm. I think
> these guys might have the best price on them, cheaper than Canadian Tire
> if I remember right. They also put mine on for a good price. They can
> be a real pain to change. They had to torch mine off!
> http://www.ontariorv.com/
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
>>
>> thank you so much for the input.
>> I did check the track bar. When I turned the steering wheel all the way
>> from
>> stop to stop, the front end moved from left to right obviously. The ball
>> joint at the frame(the joint at driver side)moved slightly up and down.
>>
>> I also checked the inside tread of the front tires, didn't find irregular
>> wear pattern.
>>
>> Any advice how to tight the ball joint or replace it, what's the cost.
>>
>> Thank you in advance.
>> "Herb" <haizhong_email@yahoo.com> wrote in message
>> news:Dt8xd.23261$pb.1555226@news20.bellglobal.com. ..
>> > 92 cherokee laredo(4L Auto) starts vibrating at 80km, the higher the
>> > speed, the higher frequency the vibration is. Get tires
>> > balanced,vibration
>> > still there. I jacked up front end, no joints found to be loose.
>> >
>> > Tire is Roughrider from Canadian Tire. I figure it might be bad tire?
>> > or
>> > the hub?
>> >
>> > Any advice on how to find out the problem?
>> >
>> > thanks
>> >
>> >
>> >
>> >
>> >