Playing around trying to rid some acceleration shake in my 99tj w/3inch Tera
system lift. Am I right to think:

turning arms clockwise lengthens arms and decreases angle?
turning arms counter-clockwise shortens arms and increases angle?

I am riding on 33" bfg at ko tires, anyone else with this combo have advise?
Transfer case has already been dropped as part of lift system.

 

Which axle are you talking about? Rear I assume? And whether to lengthen
or shorten an arm to raise or lower the pinion angle depends on if you're
talking about upper or lower arms. Which way do you need the pinion angle
to go? Further up or down?

But usually, you should not even be messing around with the pinion angle
with the OE driveshaft, especially if you don't know what you're doing...
and also because the rear pinion angle should remain parallel to the t-case
output shaft's angle with the OE driveshaft still installed.

Finally, it's right at about the 3" lift height and taller where dropping
the t-case an inch is not enough, as you've figured out. Instead of
attempting to adjust the rear axle's pinion angle which is not likely the
right approach in this circumstance, you'd probably be better off installing
1" taller motor mounts. Adding them is like dropping your t-case another
inch. For a 3" suspension lift, a 1" t-case drop and a set of 1" taller
motor mounts like from M.O.R.E. is usually enough.

Jerry
--
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"scott" <moabrat@earthlink.net> wrote in message
news:uSFgd.12556$KJ6.9433@newsread1.news.pas.earth link.net...
> Playing around trying to rid some acceleration shake in my 99tj w/3inch
> Tera system lift. Am I right to think:
>
> turning arms clockwise lengthens arms and decreases angle?
> turning arms counter-clockwise shortens arms and increases angle?
>
> I am riding on 33" bfg at ko tires, anyone else with this combo have
> advise? Transfer case has already been dropped as part of lift system.
>
>
>
>
>

 

Which axle are you talking about? Rear I assume? And whether to lengthen
or shorten an arm to raise or lower the pinion angle depends on if you're
talking about upper or lower arms. Which way do you need the pinion angle
to go? Further up or down?

But usually, you should not even be messing around with the pinion angle
with the OE driveshaft, especially if you don't know what you're doing...
and also because the rear pinion angle should remain parallel to the t-case
output shaft's angle with the OE driveshaft still installed.

Finally, it's right at about the 3" lift height and taller where dropping
the t-case an inch is not enough, as you've figured out. Instead of
attempting to adjust the rear axle's pinion angle which is not likely the
right approach in this circumstance, you'd probably be better off installing
1" taller motor mounts. Adding them is like dropping your t-case another
inch. For a 3" suspension lift, a 1" t-case drop and a set of 1" taller
motor mounts like from M.O.R.E. is usually enough.

Jerry
--
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"scott" <moabrat@earthlink.net> wrote in message
news:uSFgd.12556$KJ6.9433@newsread1.news.pas.earth link.net...
> Playing around trying to rid some acceleration shake in my 99tj w/3inch
> Tera system lift. Am I right to think:
>
> turning arms clockwise lengthens arms and decreases angle?
> turning arms counter-clockwise shortens arms and increases angle?
>
> I am riding on 33" bfg at ko tires, anyone else with this combo have
> advise? Transfer case has already been dropped as part of lift system.
>
>
>
>
>

 

Which axle are you talking about? Rear I assume? And whether to lengthen
or shorten an arm to raise or lower the pinion angle depends on if you're
talking about upper or lower arms. Which way do you need the pinion angle
to go? Further up or down?

But usually, you should not even be messing around with the pinion angle
with the OE driveshaft, especially if you don't know what you're doing...
and also because the rear pinion angle should remain parallel to the t-case
output shaft's angle with the OE driveshaft still installed.

Finally, it's right at about the 3" lift height and taller where dropping
the t-case an inch is not enough, as you've figured out. Instead of
attempting to adjust the rear axle's pinion angle which is not likely the
right approach in this circumstance, you'd probably be better off installing
1" taller motor mounts. Adding them is like dropping your t-case another
inch. For a 3" suspension lift, a 1" t-case drop and a set of 1" taller
motor mounts like from M.O.R.E. is usually enough.

Jerry
--
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"scott" <moabrat@earthlink.net> wrote in message
news:uSFgd.12556$KJ6.9433@newsread1.news.pas.earth link.net...
> Playing around trying to rid some acceleration shake in my 99tj w/3inch
> Tera system lift. Am I right to think:
>
> turning arms clockwise lengthens arms and decreases angle?
> turning arms counter-clockwise shortens arms and increases angle?
>
> I am riding on 33" bfg at ko tires, anyone else with this combo have
> advise? Transfer case has already been dropped as part of lift system.
>
>
>
>
>

 

Thanks Jerry, I do mean the rear axle. I will look into taller motor mounts
but.... I had no problems with vibration until my local shop replaced my
lower Tera controll arms with new (also Tera under warranty) lower controll
arms. I figure they did not compare with the old ones and messed up on the
length.


"Jerry Bransford" <jerrypb@***.net> wrote in message
news:3pGgd.54843$bk1.51312@fed1read05...
> Which axle are you talking about? Rear I assume? And whether to lengthen
> or shorten an arm to raise or lower the pinion angle depends on if you're
> talking about upper or lower arms. Which way do you need the pinion angle
> to go? Further up or down?
>
> But usually, you should not even be messing around with the pinion angle
> with the OE driveshaft, especially if you don't know what you're doing...
> and also because the rear pinion angle should remain parallel to the
> t-case output shaft's angle with the OE driveshaft still installed.
>
> Finally, it's right at about the 3" lift height and taller where dropping
> the t-case an inch is not enough, as you've figured out. Instead of
> attempting to adjust the rear axle's pinion angle which is not likely the
> right approach in this circumstance, you'd probably be better off
> installing 1" taller motor mounts. Adding them is like dropping your
> t-case another inch. For a 3" suspension lift, a 1" t-case drop and a set
> of 1" taller motor mounts like from M.O.R.E. is usually enough.
>
> Jerry
> --
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
> "scott" <moabrat@earthlink.net> wrote in message
> news:uSFgd.12556$KJ6.9433@newsread1.news.pas.earth link.net...
>> Playing around trying to rid some acceleration shake in my 99tj w/3inch
>> Tera system lift. Am I right to think:
>>
>> turning arms clockwise lengthens arms and decreases angle?
>> turning arms counter-clockwise shortens arms and increases angle?
>>
>> I am riding on 33" bfg at ko tires, anyone else with this combo have
>> advise? Transfer case has already been dropped as part of lift system.
>>
>>
>>
>>
>>
>
>

 

Thanks Jerry, I do mean the rear axle. I will look into taller motor mounts
but.... I had no problems with vibration until my local shop replaced my
lower Tera controll arms with new (also Tera under warranty) lower controll
arms. I figure they did not compare with the old ones and messed up on the
length.


"Jerry Bransford" <jerrypb@***.net> wrote in message
news:3pGgd.54843$bk1.51312@fed1read05...
> Which axle are you talking about? Rear I assume? And whether to lengthen
> or shorten an arm to raise or lower the pinion angle depends on if you're
> talking about upper or lower arms. Which way do you need the pinion angle
> to go? Further up or down?
>
> But usually, you should not even be messing around with the pinion angle
> with the OE driveshaft, especially if you don't know what you're doing...
> and also because the rear pinion angle should remain parallel to the
> t-case output shaft's angle with the OE driveshaft still installed.
>
> Finally, it's right at about the 3" lift height and taller where dropping
> the t-case an inch is not enough, as you've figured out. Instead of
> attempting to adjust the rear axle's pinion angle which is not likely the
> right approach in this circumstance, you'd probably be better off
> installing 1" taller motor mounts. Adding them is like dropping your
> t-case another inch. For a 3" suspension lift, a 1" t-case drop and a set
> of 1" taller motor mounts like from M.O.R.E. is usually enough.
>
> Jerry
> --
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
> "scott" <moabrat@earthlink.net> wrote in message
> news:uSFgd.12556$KJ6.9433@newsread1.news.pas.earth link.net...
>> Playing around trying to rid some acceleration shake in my 99tj w/3inch
>> Tera system lift. Am I right to think:
>>
>> turning arms clockwise lengthens arms and decreases angle?
>> turning arms counter-clockwise shortens arms and increases angle?
>>
>> I am riding on 33" bfg at ko tires, anyone else with this combo have
>> advise? Transfer case has already been dropped as part of lift system.
>>
>>
>>
>>
>>
>
>

 

Thanks Jerry, I do mean the rear axle. I will look into taller motor mounts
but.... I had no problems with vibration until my local shop replaced my
lower Tera controll arms with new (also Tera under warranty) lower controll
arms. I figure they did not compare with the old ones and messed up on the
length.


"Jerry Bransford" <jerrypb@***.net> wrote in message
news:3pGgd.54843$bk1.51312@fed1read05...
> Which axle are you talking about? Rear I assume? And whether to lengthen
> or shorten an arm to raise or lower the pinion angle depends on if you're
> talking about upper or lower arms. Which way do you need the pinion angle
> to go? Further up or down?
>
> But usually, you should not even be messing around with the pinion angle
> with the OE driveshaft, especially if you don't know what you're doing...
> and also because the rear pinion angle should remain parallel to the
> t-case output shaft's angle with the OE driveshaft still installed.
>
> Finally, it's right at about the 3" lift height and taller where dropping
> the t-case an inch is not enough, as you've figured out. Instead of
> attempting to adjust the rear axle's pinion angle which is not likely the
> right approach in this circumstance, you'd probably be better off
> installing 1" taller motor mounts. Adding them is like dropping your
> t-case another inch. For a 3" suspension lift, a 1" t-case drop and a set
> of 1" taller motor mounts like from M.O.R.E. is usually enough.
>
> Jerry
> --
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
> "scott" <moabrat@earthlink.net> wrote in message
> news:uSFgd.12556$KJ6.9433@newsread1.news.pas.earth link.net...
>> Playing around trying to rid some acceleration shake in my 99tj w/3inch
>> Tera system lift. Am I right to think:
>>
>> turning arms clockwise lengthens arms and decreases angle?
>> turning arms counter-clockwise shortens arms and increases angle?
>>
>> I am riding on 33" bfg at ko tires, anyone else with this combo have
>> advise? Transfer case has already been dropped as part of lift system.
>>
>>
>>
>>
>>
>
>

 

I was assuming you had stock arms so installing new arms could mess up the
angle even worse. It is now clear the shop that installed that already did
that... so I would adjust the length of the replacement arms back to where
the rear pinion angle is parallel to the t-case output shaft again, as it
should be when the factory driveshaft is still in place. I have no idea
which direction to go since that depends on how the shop screwed the angle
up when they installed the replacement arms.

Ideally, the rear pinion angle should be pointing 1 to 2 degrees under that
of the t-case output shaft (to counteract axle wrap) but that slight angle
is not discernable by eye alone... but it will look like the two are
parallel as illustrated in the "Geometry 101" page in the Tech Info area at
http://www.4xshaft.com/ . Look for the illustration entitled "Proper
Geometry for Conventional Two Joint Drive Shaft" which illustrates the
proper angles.

Jerry
--
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"scott" <moabrat@earthlink.net> wrote in message
news:3kNgd.12817$KJ6.7593@newsread1.news.pas.earth link.net...
> Thanks Jerry, I do mean the rear axle. I will look into taller motor
> mounts but.... I had no problems with vibration until my local shop
> replaced my lower Tera controll arms with new (also Tera under warranty)
> lower controll arms. I figure they did not compare with the old ones and
> messed up on the length.
>
>
> "Jerry Bransford" <jerrypb@***.net> wrote in message
> news:3pGgd.54843$bk1.51312@fed1read05...
>> Which axle are you talking about? Rear I assume? And whether to
>> lengthen or shorten an arm to raise or lower the pinion angle depends on
>> if you're talking about upper or lower arms. Which way do you need the
>> pinion angle to go? Further up or down?
>>
>> But usually, you should not even be messing around with the pinion angle
>> with the OE driveshaft, especially if you don't know what you're doing...
>> and also because the rear pinion angle should remain parallel to the
>> t-case output shaft's angle with the OE driveshaft still installed.
>>
>> Finally, it's right at about the 3" lift height and taller where dropping
>> the t-case an inch is not enough, as you've figured out. Instead of
>> attempting to adjust the rear axle's pinion angle which is not likely the
>> right approach in this circumstance, you'd probably be better off
>> installing 1" taller motor mounts. Adding them is like dropping your
>> t-case another inch. For a 3" suspension lift, a 1" t-case drop and a
>> set of 1" taller motor mounts like from M.O.R.E. is usually enough.
>>
>> Jerry
>> --
>> --
>> Jerry Bransford
>> PP-ASEL N6TAY
>> See the Geezer Jeep at
>> http://members.***.net/jerrypb/
>> "scott" <moabrat@earthlink.net> wrote in message
>> news:uSFgd.12556$KJ6.9433@newsread1.news.pas.earth link.net...
>>> Playing around trying to rid some acceleration shake in my 99tj w/3inch
>>> Tera system lift. Am I right to think:
>>>
>>> turning arms clockwise lengthens arms and decreases angle?
>>> turning arms counter-clockwise shortens arms and increases angle?
>>>
>>> I am riding on 33" bfg at ko tires, anyone else with this combo have
>>> advise? Transfer case has already been dropped as part of lift system.
>>>
>>>
>>>
>>>
>>>
>>
>>
>
>

 

I was assuming you had stock arms so installing new arms could mess up the
angle even worse. It is now clear the shop that installed that already did
that... so I would adjust the length of the replacement arms back to where
the rear pinion angle is parallel to the t-case output shaft again, as it
should be when the factory driveshaft is still in place. I have no idea
which direction to go since that depends on how the shop screwed the angle
up when they installed the replacement arms.

Ideally, the rear pinion angle should be pointing 1 to 2 degrees under that
of the t-case output shaft (to counteract axle wrap) but that slight angle
is not discernable by eye alone... but it will look like the two are
parallel as illustrated in the "Geometry 101" page in the Tech Info area at
http://www.4xshaft.com/ . Look for the illustration entitled "Proper
Geometry for Conventional Two Joint Drive Shaft" which illustrates the
proper angles.

Jerry
--
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"scott" <moabrat@earthlink.net> wrote in message
news:3kNgd.12817$KJ6.7593@newsread1.news.pas.earth link.net...
> Thanks Jerry, I do mean the rear axle. I will look into taller motor
> mounts but.... I had no problems with vibration until my local shop
> replaced my lower Tera controll arms with new (also Tera under warranty)
> lower controll arms. I figure they did not compare with the old ones and
> messed up on the length.
>
>
> "Jerry Bransford" <jerrypb@***.net> wrote in message
> news:3pGgd.54843$bk1.51312@fed1read05...
>> Which axle are you talking about? Rear I assume? And whether to
>> lengthen or shorten an arm to raise or lower the pinion angle depends on
>> if you're talking about upper or lower arms. Which way do you need the
>> pinion angle to go? Further up or down?
>>
>> But usually, you should not even be messing around with the pinion angle
>> with the OE driveshaft, especially if you don't know what you're doing...
>> and also because the rear pinion angle should remain parallel to the
>> t-case output shaft's angle with the OE driveshaft still installed.
>>
>> Finally, it's right at about the 3" lift height and taller where dropping
>> the t-case an inch is not enough, as you've figured out. Instead of
>> attempting to adjust the rear axle's pinion angle which is not likely the
>> right approach in this circumstance, you'd probably be better off
>> installing 1" taller motor mounts. Adding them is like dropping your
>> t-case another inch. For a 3" suspension lift, a 1" t-case drop and a
>> set of 1" taller motor mounts like from M.O.R.E. is usually enough.
>>
>> Jerry
>> --
>> --
>> Jerry Bransford
>> PP-ASEL N6TAY
>> See the Geezer Jeep at
>> http://members.***.net/jerrypb/
>> "scott" <moabrat@earthlink.net> wrote in message
>> news:uSFgd.12556$KJ6.9433@newsread1.news.pas.earth link.net...
>>> Playing around trying to rid some acceleration shake in my 99tj w/3inch
>>> Tera system lift. Am I right to think:
>>>
>>> turning arms clockwise lengthens arms and decreases angle?
>>> turning arms counter-clockwise shortens arms and increases angle?
>>>
>>> I am riding on 33" bfg at ko tires, anyone else with this combo have
>>> advise? Transfer case has already been dropped as part of lift system.
>>>
>>>
>>>
>>>
>>>
>>
>>
>
>

 

I was assuming you had stock arms so installing new arms could mess up the
angle even worse. It is now clear the shop that installed that already did
that... so I would adjust the length of the replacement arms back to where
the rear pinion angle is parallel to the t-case output shaft again, as it
should be when the factory driveshaft is still in place. I have no idea
which direction to go since that depends on how the shop screwed the angle
up when they installed the replacement arms.

Ideally, the rear pinion angle should be pointing 1 to 2 degrees under that
of the t-case output shaft (to counteract axle wrap) but that slight angle
is not discernable by eye alone... but it will look like the two are
parallel as illustrated in the "Geometry 101" page in the Tech Info area at
http://www.4xshaft.com/ . Look for the illustration entitled "Proper
Geometry for Conventional Two Joint Drive Shaft" which illustrates the
proper angles.

Jerry
--
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"scott" <moabrat@earthlink.net> wrote in message
news:3kNgd.12817$KJ6.7593@newsread1.news.pas.earth link.net...
> Thanks Jerry, I do mean the rear axle. I will look into taller motor
> mounts but.... I had no problems with vibration until my local shop
> replaced my lower Tera controll arms with new (also Tera under warranty)
> lower controll arms. I figure they did not compare with the old ones and
> messed up on the length.
>
>
> "Jerry Bransford" <jerrypb@***.net> wrote in message
> news:3pGgd.54843$bk1.51312@fed1read05...
>> Which axle are you talking about? Rear I assume? And whether to
>> lengthen or shorten an arm to raise or lower the pinion angle depends on
>> if you're talking about upper or lower arms. Which way do you need the
>> pinion angle to go? Further up or down?
>>
>> But usually, you should not even be messing around with the pinion angle
>> with the OE driveshaft, especially if you don't know what you're doing...
>> and also because the rear pinion angle should remain parallel to the
>> t-case output shaft's angle with the OE driveshaft still installed.
>>
>> Finally, it's right at about the 3" lift height and taller where dropping
>> the t-case an inch is not enough, as you've figured out. Instead of
>> attempting to adjust the rear axle's pinion angle which is not likely the
>> right approach in this circumstance, you'd probably be better off
>> installing 1" taller motor mounts. Adding them is like dropping your
>> t-case another inch. For a 3" suspension lift, a 1" t-case drop and a
>> set of 1" taller motor mounts like from M.O.R.E. is usually enough.
>>
>> Jerry
>> --
>> --
>> Jerry Bransford
>> PP-ASEL N6TAY
>> See the Geezer Jeep at
>> http://members.***.net/jerrypb/
>> "scott" <moabrat@earthlink.net> wrote in message
>> news:uSFgd.12556$KJ6.9433@newsread1.news.pas.earth link.net...
>>> Playing around trying to rid some acceleration shake in my 99tj w/3inch
>>> Tera system lift. Am I right to think:
>>>
>>> turning arms clockwise lengthens arms and decreases angle?
>>> turning arms counter-clockwise shortens arms and increases angle?
>>>
>>> I am riding on 33" bfg at ko tires, anyone else with this combo have
>>> advise? Transfer case has already been dropped as part of lift system.
>>>
>>>
>>>
>>>
>>>
>>
>>
>
>