Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive noticed
a pretty significant wobble of the t-case when taking off in 1st gear.
Transmission mounts and crossmember are all tight. Nothing seems to be
loose. I can only duplicate it by hand from the t-case itself...no movement
when pushing on the transmission. Anybody have any thoughts?

 

Did you by any chance correct the now too-steep angles that your rear
driveshaft is suffering from? Did whoever sold you or installed the lift
tell you anything about that? Because it sure sounds like the rear
driveshaft angle is excessive, causing u-joint vibrations.

Jerry
--
Jerry Bransford
To email, remove 'me' from my email address
KC6TAY, PP-ASEL
See the Geezer Jeep at
http://members.***.net/jerrypb/

"Aaron Prater" <alprater@***.net> wrote in message
news:8DKcb.5287$Rd4.292@fed1read07...
> Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive
noticed
> a pretty significant wobble of the t-case when taking off in 1st gear.
> Transmission mounts and crossmember are all tight. Nothing seems to be
> loose. I can only duplicate it by hand from the t-case itself...no
movement
> when pushing on the transmission. Anybody have any thoughts?
>
>

 

Did you by any chance correct the now too-steep angles that your rear
driveshaft is suffering from? Did whoever sold you or installed the lift
tell you anything about that? Because it sure sounds like the rear
driveshaft angle is excessive, causing u-joint vibrations.

Jerry
--
Jerry Bransford
To email, remove 'me' from my email address
KC6TAY, PP-ASEL
See the Geezer Jeep at
http://members.***.net/jerrypb/

"Aaron Prater" <alprater@***.net> wrote in message
news:8DKcb.5287$Rd4.292@fed1read07...
> Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive
noticed
> a pretty significant wobble of the t-case when taking off in 1st gear.
> Transmission mounts and crossmember are all tight. Nothing seems to be
> loose. I can only duplicate it by hand from the t-case itself...no
movement
> when pushing on the transmission. Anybody have any thoughts?
>
>

 

Sounds like he needs a tcase drop or an sye. Can you do motor mounts that
are taller on a tj?
KH

"Jerry Bransford" <jerrypb@mecox.net> wrote in message
news:LKLcb.18240$gv5.5656@fed1read05...
> Did you by any chance correct the now too-steep angles that your rear
> driveshaft is suffering from? Did whoever sold you or installed the lift
> tell you anything about that? Because it sure sounds like the rear
> driveshaft angle is excessive, causing u-joint vibrations.
>
> Jerry
> --
> Jerry Bransford
> To email, remove 'me' from my email address
> KC6TAY, PP-ASEL
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
>
> "Aaron Prater" <alprater@***.net> wrote in message
> news:8DKcb.5287$Rd4.292@fed1read07...
> > Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive
> noticed
> > a pretty significant wobble of the t-case when taking off in 1st gear.
> > Transmission mounts and crossmember are all tight. Nothing seems to be
> > loose. I can only duplicate it by hand from the t-case itself...no
> movement
> > when pushing on the transmission. Anybody have any thoughts?
> >
> >
>
>

 

Sounds like he needs a tcase drop or an sye. Can you do motor mounts that
are taller on a tj?
KH

"Jerry Bransford" <jerrypb@mecox.net> wrote in message
news:LKLcb.18240$gv5.5656@fed1read05...
> Did you by any chance correct the now too-steep angles that your rear
> driveshaft is suffering from? Did whoever sold you or installed the lift
> tell you anything about that? Because it sure sounds like the rear
> driveshaft angle is excessive, causing u-joint vibrations.
>
> Jerry
> --
> Jerry Bransford
> To email, remove 'me' from my email address
> KC6TAY, PP-ASEL
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
>
> "Aaron Prater" <alprater@***.net> wrote in message
> news:8DKcb.5287$Rd4.292@fed1read07...
> > Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive
> noticed
> > a pretty significant wobble of the t-case when taking off in 1st gear.
> > Transmission mounts and crossmember are all tight. Nothing seems to be
> > loose. I can only duplicate it by hand from the t-case itself...no
> movement
> > when pushing on the transmission. Anybody have any thoughts?
> >
> >
>
>

 

yeah, ive got the tcase lowering kit installed..the u joints themselves show
no movement or seperation..how steep is too steep?..

"Jerry Bransford" <jerrypb@mecox.net> wrote in message
news:LKLcb.18240$gv5.5656@fed1read05...
> Did you by any chance correct the now too-steep angles that your rear
> driveshaft is suffering from? Did whoever sold you or installed the lift
> tell you anything about that? Because it sure sounds like the rear
> driveshaft angle is excessive, causing u-joint vibrations.
>
> Jerry
> --
> Jerry Bransford
> To email, remove 'me' from my email address
> KC6TAY, PP-ASEL
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
>
> "Aaron Prater" <alprater@***.net> wrote in message
> news:8DKcb.5287$Rd4.292@fed1read07...
> > Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive
> noticed
> > a pretty significant wobble of the t-case when taking off in 1st gear.
> > Transmission mounts and crossmember are all tight. Nothing seems to be
> > loose. I can only duplicate it by hand from the t-case itself...no
> movement
> > when pushing on the transmission. Anybody have any thoughts?
> >
> >
>
>

 

yeah, ive got the tcase lowering kit installed..the u joints themselves show
no movement or seperation..how steep is too steep?..

"Jerry Bransford" <jerrypb@mecox.net> wrote in message
news:LKLcb.18240$gv5.5656@fed1read05...
> Did you by any chance correct the now too-steep angles that your rear
> driveshaft is suffering from? Did whoever sold you or installed the lift
> tell you anything about that? Because it sure sounds like the rear
> driveshaft angle is excessive, causing u-joint vibrations.
>
> Jerry
> --
> Jerry Bransford
> To email, remove 'me' from my email address
> KC6TAY, PP-ASEL
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
>
> "Aaron Prater" <alprater@***.net> wrote in message
> news:8DKcb.5287$Rd4.292@fed1read07...
> > Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive
> noticed
> > a pretty significant wobble of the t-case when taking off in 1st gear.
> > Transmission mounts and crossmember are all tight. Nothing seems to be
> > loose. I can only duplicate it by hand from the t-case itself...no
> movement
> > when pushing on the transmission. Anybody have any thoughts?
> >
> >
>
>

 

Aaron, typically speaking, dropping the t-case 1" is usually insufficient to
eliminate the vibrations caused by the steepness of the rear driveshaft
after a 4" suspension lift has been installed. The shop who installed or
sold you your 4" lift should have clued you into this more ahead of time. I
don't recommend dropping the t-case more, but the angles could probably be
reduced enough to eliminate the vibrations if you also installed a set of 1"
taller motor mounts. Those will tip the engine just a little, enough to
reduce the angle between the drivetrain's (engine-tranny-transfer case)
output shaft and the rear driveshaft.

Better yet, a SYE (slip yoke eliminator) kit installed into the transfer
case and a new longer CV (constant velocity) driveshaft is the real cure,
and the strongly recommended way to go. This setup is the proper way to
cure the angle (vibration) problems caused by a 4" or taller lift. The
longer driveshaft is required because the factory driveshaft also becomes
too short after a 4" lift has been installed... which means on the trail,
the driveshaft could be pulled off the slip-joint at the end of the transfer
case's output shaft. This is about $500 worth of parts, but strongly
recommended... and is the "right" way to cure this problem.

Jerry
--
Jerry Bransford
To email, remove 'me' from my email address
KC6TAY, PP-ASEL
See the Geezer Jeep at
http://members.***.net/jerrypb/

"Aaron Prater" <alprater@***.net> wrote in message
news:XrXcb.6365$Rd4.2681@fed1read07...
> yeah, ive got the tcase lowering kit installed..the u joints themselves
show
> no movement or seperation..how steep is too steep?..
>
> "Jerry Bransford" <jerrypb@mecox.net> wrote in message
> news:LKLcb.18240$gv5.5656@fed1read05...
> > Did you by any chance correct the now too-steep angles that your rear
> > driveshaft is suffering from? Did whoever sold you or installed the
lift
> > tell you anything about that? Because it sure sounds like the rear
> > driveshaft angle is excessive, causing u-joint vibrations.
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Aaron Prater" <alprater@***.net> wrote in message
> > news:8DKcb.5287$Rd4.292@fed1read07...
> > > Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive
> > noticed
> > > a pretty significant wobble of the t-case when taking off in 1st gear.
> > > Transmission mounts and crossmember are all tight. Nothing seems to
be
> > > loose. I can only duplicate it by hand from the t-case itself...no
> > movement
> > > when pushing on the transmission. Anybody have any thoughts?
> > >
> > >
> >
> >
>
>

 

Aaron, typically speaking, dropping the t-case 1" is usually insufficient to
eliminate the vibrations caused by the steepness of the rear driveshaft
after a 4" suspension lift has been installed. The shop who installed or
sold you your 4" lift should have clued you into this more ahead of time. I
don't recommend dropping the t-case more, but the angles could probably be
reduced enough to eliminate the vibrations if you also installed a set of 1"
taller motor mounts. Those will tip the engine just a little, enough to
reduce the angle between the drivetrain's (engine-tranny-transfer case)
output shaft and the rear driveshaft.

Better yet, a SYE (slip yoke eliminator) kit installed into the transfer
case and a new longer CV (constant velocity) driveshaft is the real cure,
and the strongly recommended way to go. This setup is the proper way to
cure the angle (vibration) problems caused by a 4" or taller lift. The
longer driveshaft is required because the factory driveshaft also becomes
too short after a 4" lift has been installed... which means on the trail,
the driveshaft could be pulled off the slip-joint at the end of the transfer
case's output shaft. This is about $500 worth of parts, but strongly
recommended... and is the "right" way to cure this problem.

Jerry
--
Jerry Bransford
To email, remove 'me' from my email address
KC6TAY, PP-ASEL
See the Geezer Jeep at
http://members.***.net/jerrypb/

"Aaron Prater" <alprater@***.net> wrote in message
news:XrXcb.6365$Rd4.2681@fed1read07...
> yeah, ive got the tcase lowering kit installed..the u joints themselves
show
> no movement or seperation..how steep is too steep?..
>
> "Jerry Bransford" <jerrypb@mecox.net> wrote in message
> news:LKLcb.18240$gv5.5656@fed1read05...
> > Did you by any chance correct the now too-steep angles that your rear
> > driveshaft is suffering from? Did whoever sold you or installed the
lift
> > tell you anything about that? Because it sure sounds like the rear
> > driveshaft angle is excessive, causing u-joint vibrations.
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Aaron Prater" <alprater@***.net> wrote in message
> > news:8DKcb.5287$Rd4.292@fed1read07...
> > > Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive
> > noticed
> > > a pretty significant wobble of the t-case when taking off in 1st gear.
> > > Transmission mounts and crossmember are all tight. Nothing seems to
be
> > > loose. I can only duplicate it by hand from the t-case itself...no
> > movement
> > > when pushing on the transmission. Anybody have any thoughts?
> > >
> > >
> >
> >
>
>

 

You can, but I believe it requires a 1" body lift.

--
Jim
98 TJ SE
90 SJ GW
http://www.delawareja.com/gallery/JDJeep98


"Kevin in San Diego" <kevin_hedstrom@yahoo.com> wrote in message
news:7oRcb.20455$gv5.7412@fed1read05...
> Sounds like he needs a tcase drop or an sye. Can you do motor mounts that
> are taller on a tj?
> KH
>
> "Jerry Bransford" <jerrypb@mecox.net> wrote in message
> news:LKLcb.18240$gv5.5656@fed1read05...
> > Did you by any chance correct the now too-steep angles that your rear
> > driveshaft is suffering from? Did whoever sold you or installed the
lift
> > tell you anything about that? Because it sure sounds like the rear
> > driveshaft angle is excessive, causing u-joint vibrations.
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Aaron Prater" <alprater@***.net> wrote in message
> > news:8DKcb.5287$Rd4.292@fed1read07...
> > > Just installed a 4" Procomp lift on my 98 TJ. Since the install Ive
> > noticed
> > > a pretty significant wobble of the t-case when taking off in 1st gear.
> > > Transmission mounts and crossmember are all tight. Nothing seems to
be
> > > loose. I can only duplicate it by hand from the t-case itself...no
> > movement
> > > when pushing on the transmission. Anybody have any thoughts?
> > >
> > >
> >
> >
>
>