Hold off on the rear trackbar for a bit. Let's see if you can dial it in
as is, first. I would definately lose the drop kit. You simply do not
need it with a quality CV shaft. (Tom Wood makes a nice one)

Try this...drive the Jeep to the speed you feel the vibes starting and
hang around that speed for this test. Just cruise and slowly accelerate
and decelerate through the vibes. Concentrate on when you feel the
vibes. If you feel the vibes on acceleration only, your pinion is
pointed too high, if on deceleration only, it's too low. They should go
away at 'coast' and not be present at both 'acceleration' and
'deceleration' if they are pinion angle related. If they don't, you have
another issue and it is probably not your pinion angle.

Now, I didn't realize you didn't have ANY adjustable control arms up
front. Yes, you need those to properly set your camber, or get it closer
to stock specs. If your camber is too vertical, you may feel the Jeep
wandering or odd steering corrections. Also, if your front driveshaft is
at too much of an angle, you can cause vibe problems. You also might
remove the front driveshaft to eliminate it, or pinpoint it, as the culprit.

tw
__________________________________________________ ___________________
2003 TJ Rubicon * 2001 XJ Sport * 1971 Bill Stroppe Baja Bronco

"There is a very fine line between 'hobby' and 'mental illness'."

Pronunciation: 'jEp Function: noun Date: 1940

Etymology: from g. p. (G= 'Government' P= '80 inch wheelbase')
A small general-purpose motor vehicle with 80" wheelbase, 1/4-ton
capacity and four-wheel drive used by the U.S. army in World War II.
__________________________________________________ ___________________


Troy wrote:
> I start noticing them now at around 45mph, then at 65-70. Much better
> though than before. I was under again today and looks like I do need the
> adjustable trackbar to get the rear driveline straight. I would like to get
> rid of the spacers but I'm gonna hold off until I get the trackbar, and
> probably some new adjustable control arms for the front since it has a cv
> driveshaft also but no pinion angle adjustments. With the case lifted it
> pointed straight back instead of to the shaft. Had the tires balanced and
> rotated today also. It's not my daily driver luckily so ujoint damage isn't
> great hopefully.
>
> I remember reading in a post that in my setup the angle of the rear pinion
> should be towards the output shaft, but with 1-3 degrees up for axle wrap,
> is this correct?
>
> Troy
>
>

 

Hold off on the rear trackbar for a bit. Let's see if you can dial it in
as is, first. I would definately lose the drop kit. You simply do not
need it with a quality CV shaft. (Tom Wood makes a nice one)

Try this...drive the Jeep to the speed you feel the vibes starting and
hang around that speed for this test. Just cruise and slowly accelerate
and decelerate through the vibes. Concentrate on when you feel the
vibes. If you feel the vibes on acceleration only, your pinion is
pointed too high, if on deceleration only, it's too low. They should go
away at 'coast' and not be present at both 'acceleration' and
'deceleration' if they are pinion angle related. If they don't, you have
another issue and it is probably not your pinion angle.

Now, I didn't realize you didn't have ANY adjustable control arms up
front. Yes, you need those to properly set your camber, or get it closer
to stock specs. If your camber is too vertical, you may feel the Jeep
wandering or odd steering corrections. Also, if your front driveshaft is
at too much of an angle, you can cause vibe problems. You also might
remove the front driveshaft to eliminate it, or pinpoint it, as the culprit.

tw
__________________________________________________ ___________________
2003 TJ Rubicon * 2001 XJ Sport * 1971 Bill Stroppe Baja Bronco

"There is a very fine line between 'hobby' and 'mental illness'."

Pronunciation: 'jEp Function: noun Date: 1940

Etymology: from g. p. (G= 'Government' P= '80 inch wheelbase')
A small general-purpose motor vehicle with 80" wheelbase, 1/4-ton
capacity and four-wheel drive used by the U.S. army in World War II.
__________________________________________________ ___________________


Troy wrote:
> I start noticing them now at around 45mph, then at 65-70. Much better
> though than before. I was under again today and looks like I do need the
> adjustable trackbar to get the rear driveline straight. I would like to get
> rid of the spacers but I'm gonna hold off until I get the trackbar, and
> probably some new adjustable control arms for the front since it has a cv
> driveshaft also but no pinion angle adjustments. With the case lifted it
> pointed straight back instead of to the shaft. Had the tires balanced and
> rotated today also. It's not my daily driver luckily so ujoint damage isn't
> great hopefully.
>
> I remember reading in a post that in my setup the angle of the rear pinion
> should be towards the output shaft, but with 1-3 degrees up for axle wrap,
> is this correct?
>
> Troy
>
>

 

This is Troy, I'm using my brothers account since my tools are at his house.

I kept the spacers on for now, and adjusted the rear upper control arms
correctly for the pinion angle, since I dont have adjustable arms up front.
So things are where they're kinda supposed to be, and now I can get up to
70mph without major vibes. But now something else comes to mind.

This lift I have is just crappy, I wouldn't recommend it to anyone. That
being said, when it was lifted it didn't come with an adjustable track bar
so my d30 was sitting a little bit to the left. The store that I bought the
lift from, and who installs them (they didn't install mine) said to drill a
hole in the track bar bracket (on the axle) about 1/2 of an inch iirc to
adjust for the change. I haven't had a problem with it so far. Now I'm
wondering if the same should be done to the rear track bar's bracket?
There's not much of a noticable difference in the way it sits since the lift
came with a bracket for the rear track bar, however when under the jeep I
look up at the rear driveshaft and notice it's not straight... it's sitting
to the side a little bit. How much is a little I can't exactly say but its
definately noticable. Could the vibes be coming from the sideways slant? I
suspect they are.

I checked out the bracket and there's room for me to drill another hole and
move the bar to the side enough to center the rear axle, I just wanted to
check with everyone here to see if their rear shaft is straight when viewed
from the bottom.

Troy

 

This is Troy, I'm using my brothers account since my tools are at his house.

I kept the spacers on for now, and adjusted the rear upper control arms
correctly for the pinion angle, since I dont have adjustable arms up front.
So things are where they're kinda supposed to be, and now I can get up to
70mph without major vibes. But now something else comes to mind.

This lift I have is just crappy, I wouldn't recommend it to anyone. That
being said, when it was lifted it didn't come with an adjustable track bar
so my d30 was sitting a little bit to the left. The store that I bought the
lift from, and who installs them (they didn't install mine) said to drill a
hole in the track bar bracket (on the axle) about 1/2 of an inch iirc to
adjust for the change. I haven't had a problem with it so far. Now I'm
wondering if the same should be done to the rear track bar's bracket?
There's not much of a noticable difference in the way it sits since the lift
came with a bracket for the rear track bar, however when under the jeep I
look up at the rear driveshaft and notice it's not straight... it's sitting
to the side a little bit. How much is a little I can't exactly say but its
definately noticable. Could the vibes be coming from the sideways slant? I
suspect they are.

I checked out the bracket and there's room for me to drill another hole and
move the bar to the side enough to center the rear axle, I just wanted to
check with everyone here to see if their rear shaft is straight when viewed
from the bottom.

Troy

 

This is Troy, I'm using my brothers account since my tools are at his house.

I kept the spacers on for now, and adjusted the rear upper control arms
correctly for the pinion angle, since I dont have adjustable arms up front.
So things are where they're kinda supposed to be, and now I can get up to
70mph without major vibes. But now something else comes to mind.

This lift I have is just crappy, I wouldn't recommend it to anyone. That
being said, when it was lifted it didn't come with an adjustable track bar
so my d30 was sitting a little bit to the left. The store that I bought the
lift from, and who installs them (they didn't install mine) said to drill a
hole in the track bar bracket (on the axle) about 1/2 of an inch iirc to
adjust for the change. I haven't had a problem with it so far. Now I'm
wondering if the same should be done to the rear track bar's bracket?
There's not much of a noticable difference in the way it sits since the lift
came with a bracket for the rear track bar, however when under the jeep I
look up at the rear driveshaft and notice it's not straight... it's sitting
to the side a little bit. How much is a little I can't exactly say but its
definately noticable. Could the vibes be coming from the sideways slant? I
suspect they are.

I checked out the bracket and there's room for me to drill another hole and
move the bar to the side enough to center the rear axle, I just wanted to
check with everyone here to see if their rear shaft is straight when viewed
from the bottom.

Troy

 

They make a bracket for that so you keep the structural strength and
flex angles. You can try the new hole, but be aware you might have to
do some fixing later if it tears through. That part has a fair bit if
stress on it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Mark wrote:
>
> This is Troy, I'm using my brothers account since my tools are at his house.
>
> I kept the spacers on for now, and adjusted the rear upper control arms
> correctly for the pinion angle, since I dont have adjustable arms up front.
> So things are where they're kinda supposed to be, and now I can get up to
> 70mph without major vibes. But now something else comes to mind.
>
> This lift I have is just crappy, I wouldn't recommend it to anyone. That
> being said, when it was lifted it didn't come with an adjustable track bar
> so my d30 was sitting a little bit to the left. The store that I bought the
> lift from, and who installs them (they didn't install mine) said to drill a
> hole in the track bar bracket (on the axle) about 1/2 of an inch iirc to
> adjust for the change. I haven't had a problem with it so far. Now I'm
> wondering if the same should be done to the rear track bar's bracket?
> There's not much of a noticable difference in the way it sits since the lift
> came with a bracket for the rear track bar, however when under the jeep I
> look up at the rear driveshaft and notice it's not straight... it's sitting
> to the side a little bit. How much is a little I can't exactly say but its
> definately noticable. Could the vibes be coming from the sideways slant? I
> suspect they are.
>
> I checked out the bracket and there's room for me to drill another hole and
> move the bar to the side enough to center the rear axle, I just wanted to
> check with everyone here to see if their rear shaft is straight when viewed
> from the bottom.
>
> Troy

 

They make a bracket for that so you keep the structural strength and
flex angles. You can try the new hole, but be aware you might have to
do some fixing later if it tears through. That part has a fair bit if
stress on it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Mark wrote:
>
> This is Troy, I'm using my brothers account since my tools are at his house.
>
> I kept the spacers on for now, and adjusted the rear upper control arms
> correctly for the pinion angle, since I dont have adjustable arms up front.
> So things are where they're kinda supposed to be, and now I can get up to
> 70mph without major vibes. But now something else comes to mind.
>
> This lift I have is just crappy, I wouldn't recommend it to anyone. That
> being said, when it was lifted it didn't come with an adjustable track bar
> so my d30 was sitting a little bit to the left. The store that I bought the
> lift from, and who installs them (they didn't install mine) said to drill a
> hole in the track bar bracket (on the axle) about 1/2 of an inch iirc to
> adjust for the change. I haven't had a problem with it so far. Now I'm
> wondering if the same should be done to the rear track bar's bracket?
> There's not much of a noticable difference in the way it sits since the lift
> came with a bracket for the rear track bar, however when under the jeep I
> look up at the rear driveshaft and notice it's not straight... it's sitting
> to the side a little bit. How much is a little I can't exactly say but its
> definately noticable. Could the vibes be coming from the sideways slant? I
> suspect they are.
>
> I checked out the bracket and there's room for me to drill another hole and
> move the bar to the side enough to center the rear axle, I just wanted to
> check with everyone here to see if their rear shaft is straight when viewed
> from the bottom.
>
> Troy

 

They make a bracket for that so you keep the structural strength and
flex angles. You can try the new hole, but be aware you might have to
do some fixing later if it tears through. That part has a fair bit if
stress on it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Mark wrote:
>
> This is Troy, I'm using my brothers account since my tools are at his house.
>
> I kept the spacers on for now, and adjusted the rear upper control arms
> correctly for the pinion angle, since I dont have adjustable arms up front.
> So things are where they're kinda supposed to be, and now I can get up to
> 70mph without major vibes. But now something else comes to mind.
>
> This lift I have is just crappy, I wouldn't recommend it to anyone. That
> being said, when it was lifted it didn't come with an adjustable track bar
> so my d30 was sitting a little bit to the left. The store that I bought the
> lift from, and who installs them (they didn't install mine) said to drill a
> hole in the track bar bracket (on the axle) about 1/2 of an inch iirc to
> adjust for the change. I haven't had a problem with it so far. Now I'm
> wondering if the same should be done to the rear track bar's bracket?
> There's not much of a noticable difference in the way it sits since the lift
> came with a bracket for the rear track bar, however when under the jeep I
> look up at the rear driveshaft and notice it's not straight... it's sitting
> to the side a little bit. How much is a little I can't exactly say but its
> definately noticable. Could the vibes be coming from the sideways slant? I
> suspect they are.
>
> I checked out the bracket and there's room for me to drill another hole and
> move the bar to the side enough to center the rear axle, I just wanted to
> check with everyone here to see if their rear shaft is straight when viewed
> from the bottom.
>
> Troy

 

With a 4" lift, you should have a rear trackbar drop bracket installed.
You should not be using the stock trackbar with the stock bracket.

tw
__________________________________________________ ___________________
2003 TJ Rubicon * 2001 XJ Sport * 1971 Bill Stroppe Baja Bronco

"There is a very fine line between 'hobby' and 'mental illness'."

Pronunciation: 'jEp Function: noun Date: 1940

Etymology: from g. p. (G= 'Government' P= '80 inch wheelbase')
A small general-purpose motor vehicle with 80" wheelbase, 1/4-ton
capacity and four-wheel drive used by the U.S. army in World War II.
__________________________________________________ ___________________


Mark wrote:
> This is Troy, I'm using my brothers account since my tools are at his house.
>
> I kept the spacers on for now, and adjusted the rear upper control arms
> correctly for the pinion angle, since I dont have adjustable arms up front.
> So things are where they're kinda supposed to be, and now I can get up to
> 70mph without major vibes. But now something else comes to mind.
>
> This lift I have is just crappy, I wouldn't recommend it to anyone. That
> being said, when it was lifted it didn't come with an adjustable track bar
> so my d30 was sitting a little bit to the left. The store that I bought the
> lift from, and who installs them (they didn't install mine) said to drill a
> hole in the track bar bracket (on the axle) about 1/2 of an inch iirc to
> adjust for the change. I haven't had a problem with it so far. Now I'm
> wondering if the same should be done to the rear track bar's bracket?
> There's not much of a noticable difference in the way it sits since the lift
> came with a bracket for the rear track bar, however when under the jeep I
> look up at the rear driveshaft and notice it's not straight... it's sitting
> to the side a little bit. How much is a little I can't exactly say but its
> definately noticable. Could the vibes be coming from the sideways slant? I
> suspect they are.
>
> I checked out the bracket and there's room for me to drill another hole and
> move the bar to the side enough to center the rear axle, I just wanted to
> check with everyone here to see if their rear shaft is straight when viewed
> from the bottom.
>
> Troy
>
>

 

With a 4" lift, you should have a rear trackbar drop bracket installed.
You should not be using the stock trackbar with the stock bracket.

tw
__________________________________________________ ___________________
2003 TJ Rubicon * 2001 XJ Sport * 1971 Bill Stroppe Baja Bronco

"There is a very fine line between 'hobby' and 'mental illness'."

Pronunciation: 'jEp Function: noun Date: 1940

Etymology: from g. p. (G= 'Government' P= '80 inch wheelbase')
A small general-purpose motor vehicle with 80" wheelbase, 1/4-ton
capacity and four-wheel drive used by the U.S. army in World War II.
__________________________________________________ ___________________


Mark wrote:
> This is Troy, I'm using my brothers account since my tools are at his house.
>
> I kept the spacers on for now, and adjusted the rear upper control arms
> correctly for the pinion angle, since I dont have adjustable arms up front.
> So things are where they're kinda supposed to be, and now I can get up to
> 70mph without major vibes. But now something else comes to mind.
>
> This lift I have is just crappy, I wouldn't recommend it to anyone. That
> being said, when it was lifted it didn't come with an adjustable track bar
> so my d30 was sitting a little bit to the left. The store that I bought the
> lift from, and who installs them (they didn't install mine) said to drill a
> hole in the track bar bracket (on the axle) about 1/2 of an inch iirc to
> adjust for the change. I haven't had a problem with it so far. Now I'm
> wondering if the same should be done to the rear track bar's bracket?
> There's not much of a noticable difference in the way it sits since the lift
> came with a bracket for the rear track bar, however when under the jeep I
> look up at the rear driveshaft and notice it's not straight... it's sitting
> to the side a little bit. How much is a little I can't exactly say but its
> definately noticable. Could the vibes be coming from the sideways slant? I
> suspect they are.
>
> I checked out the bracket and there's room for me to drill another hole and
> move the bar to the side enough to center the rear axle, I just wanted to
> check with everyone here to see if their rear shaft is straight when viewed
> from the bottom.
>
> Troy
>
>