Hi all,

I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
home from the dealer, I started noticing that sometimes when I stop,
as soon as I come to a full and complete stop, I get an extra little
lurch / bump. It's somewhat similar to the "bump stop" described in
TSB 030400, but I don't think that's it...partially because it's an
'04, which isn't covered under that TSB, and partially because it
happens immediately upon stopping, not a few seconds after, and it
never happens when I'm accelerating.

Anybody have any idea what this could be? If it's powertrain-related,
I have a 30-day, 3k mile warranty that will get it fixed, but it would
help to have a good idea what the problem is when I go back to the
dealer, so they don't just tell me it's not any of the powertrain
components, and send me home...

Thanks,
Tom

 

I recently had the bump/stop problem fixed on an '04 JGC 4.0/Selectrac I
bought used and so far so good. The TSB summary I saw on the KJ website
applies to V8 models and talks about replacing the driveshaft but it
also contains a Note that on 4.0's the splines should be greased. The
service writer I talked to said it was very common, doesn't hurt
anything, and might come back eventually. They pulled the driveshaft and
greased it in about half an hour. Mine is still under the 3/36 warranty
so I don't know if the powertrain warranty covers it.

Mine would only do it after a delay or on acceleration after very gentle
stops, most of the time it happened as the rear end settled right at the
end of a stop. One way to confirm it's the driveshaft is put it in
neutral before you stop and see if it goes away. The service writer told
me a similar problem is sometimes caused by a bad ball joint between the
upper control arm and the top of the differential.

Also FWIW, there's a TSB on the '05 model that too much grease can
accumulate in the boot and cause a driveshaft imbalance condition,
something to remember if you ever fix it yourself.

In article <1185762014.273108.163480@x35g2000prf.googlegroups .com>,
googlegroups@gersic.com says...
> Hi all,
>
> I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
> home from the dealer, I started noticing that sometimes when I stop,
> as soon as I come to a full and complete stop, I get an extra little
> lurch / bump. It's somewhat similar to the "bump stop" described in
> TSB 030400, but I don't think that's it...partially because it's an
> '04, which isn't covered under that TSB, and partially because it
> happens immediately upon stopping, not a few seconds after, and it
> never happens when I'm accelerating.
>
> Anybody have any idea what this could be? If it's powertrain-related,
> I have a 30-day, 3k mile warranty that will get it fixed, but it would
> help to have a good idea what the problem is when I go back to the
> dealer, so they don't just tell me it's not any of the powertrain
> components, and send me home...
>
> Thanks,
> Tom
>
>

 

I recently had the bump/stop problem fixed on an '04 JGC 4.0/Selectrac I
bought used and so far so good. The TSB summary I saw on the KJ website
applies to V8 models and talks about replacing the driveshaft but it
also contains a Note that on 4.0's the splines should be greased. The
service writer I talked to said it was very common, doesn't hurt
anything, and might come back eventually. They pulled the driveshaft and
greased it in about half an hour. Mine is still under the 3/36 warranty
so I don't know if the powertrain warranty covers it.

Mine would only do it after a delay or on acceleration after very gentle
stops, most of the time it happened as the rear end settled right at the
end of a stop. One way to confirm it's the driveshaft is put it in
neutral before you stop and see if it goes away. The service writer told
me a similar problem is sometimes caused by a bad ball joint between the
upper control arm and the top of the differential.

Also FWIW, there's a TSB on the '05 model that too much grease can
accumulate in the boot and cause a driveshaft imbalance condition,
something to remember if you ever fix it yourself.

In article <1185762014.273108.163480@x35g2000prf.googlegroups .com>,
googlegroups@gersic.com says...
> Hi all,
>
> I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
> home from the dealer, I started noticing that sometimes when I stop,
> as soon as I come to a full and complete stop, I get an extra little
> lurch / bump. It's somewhat similar to the "bump stop" described in
> TSB 030400, but I don't think that's it...partially because it's an
> '04, which isn't covered under that TSB, and partially because it
> happens immediately upon stopping, not a few seconds after, and it
> never happens when I'm accelerating.
>
> Anybody have any idea what this could be? If it's powertrain-related,
> I have a 30-day, 3k mile warranty that will get it fixed, but it would
> help to have a good idea what the problem is when I go back to the
> dealer, so they don't just tell me it's not any of the powertrain
> components, and send me home...
>
> Thanks,
> Tom
>
>

 

I recently had the bump/stop problem fixed on an '04 JGC 4.0/Selectrac I
bought used and so far so good. The TSB summary I saw on the KJ website
applies to V8 models and talks about replacing the driveshaft but it
also contains a Note that on 4.0's the splines should be greased. The
service writer I talked to said it was very common, doesn't hurt
anything, and might come back eventually. They pulled the driveshaft and
greased it in about half an hour. Mine is still under the 3/36 warranty
so I don't know if the powertrain warranty covers it.

Mine would only do it after a delay or on acceleration after very gentle
stops, most of the time it happened as the rear end settled right at the
end of a stop. One way to confirm it's the driveshaft is put it in
neutral before you stop and see if it goes away. The service writer told
me a similar problem is sometimes caused by a bad ball joint between the
upper control arm and the top of the differential.

Also FWIW, there's a TSB on the '05 model that too much grease can
accumulate in the boot and cause a driveshaft imbalance condition,
something to remember if you ever fix it yourself.

In article <1185762014.273108.163480@x35g2000prf.googlegroups .com>,
googlegroups@gersic.com says...
> Hi all,
>
> I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
> home from the dealer, I started noticing that sometimes when I stop,
> as soon as I come to a full and complete stop, I get an extra little
> lurch / bump. It's somewhat similar to the "bump stop" described in
> TSB 030400, but I don't think that's it...partially because it's an
> '04, which isn't covered under that TSB, and partially because it
> happens immediately upon stopping, not a few seconds after, and it
> never happens when I'm accelerating.
>
> Anybody have any idea what this could be? If it's powertrain-related,
> I have a 30-day, 3k mile warranty that will get it fixed, but it would
> help to have a good idea what the problem is when I go back to the
> dealer, so they don't just tell me it's not any of the powertrain
> components, and send me home...
>
> Thanks,
> Tom
>
>

 

I recently had the bump/stop problem fixed on an '04 JGC 4.0/Selectrac I
bought used and so far so good. The TSB summary I saw on the KJ website
applies to V8 models and talks about replacing the driveshaft but it
also contains a Note that on 4.0's the splines should be greased. The
service writer I talked to said it was very common, doesn't hurt
anything, and might come back eventually. They pulled the driveshaft and
greased it in about half an hour. Mine is still under the 3/36 warranty
so I don't know if the powertrain warranty covers it.

Mine would only do it after a delay or on acceleration after very gentle
stops, most of the time it happened as the rear end settled right at the
end of a stop. One way to confirm it's the driveshaft is put it in
neutral before you stop and see if it goes away. The service writer told
me a similar problem is sometimes caused by a bad ball joint between the
upper control arm and the top of the differential.

Also FWIW, there's a TSB on the '05 model that too much grease can
accumulate in the boot and cause a driveshaft imbalance condition,
something to remember if you ever fix it yourself.

In article <1185762014.273108.163480@x35g2000prf.googlegroups .com>,
googlegroups@gersic.com says...
> Hi all,
>
> I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
> home from the dealer, I started noticing that sometimes when I stop,
> as soon as I come to a full and complete stop, I get an extra little
> lurch / bump. It's somewhat similar to the "bump stop" described in
> TSB 030400, but I don't think that's it...partially because it's an
> '04, which isn't covered under that TSB, and partially because it
> happens immediately upon stopping, not a few seconds after, and it
> never happens when I'm accelerating.
>
> Anybody have any idea what this could be? If it's powertrain-related,
> I have a 30-day, 3k mile warranty that will get it fixed, but it would
> help to have a good idea what the problem is when I go back to the
> dealer, so they don't just tell me it's not any of the powertrain
> components, and send me home...
>
> Thanks,
> Tom
>
>

 

That should have read "WJ website". The URL is:

http://www.wjjeeps.com/jmenu.htm

In article <MPG.2118d9164d74dca99898d5@news.chi.sbcglobal.net >,
Sorry@nomail.com says...
> I recently had the bump/stop problem fixed on an '04 JGC 4.0/Selectrac I
> bought used and so far so good. The TSB summary I saw on the KJ website
> applies to V8 models and talks about replacing the driveshaft but it
> also contains a Note that on 4.0's the splines should be greased. The
> service writer I talked to said it was very common, doesn't hurt
> anything, and might come back eventually. They pulled the driveshaft and
> greased it in about half an hour. Mine is still under the 3/36 warranty
> so I don't know if the powertrain warranty covers it.
>
> Mine would only do it after a delay or on acceleration after very gentle
> stops, most of the time it happened as the rear end settled right at the
> end of a stop. One way to confirm it's the driveshaft is put it in
> neutral before you stop and see if it goes away. The service writer told
> me a similar problem is sometimes caused by a bad ball joint between the
> upper control arm and the top of the differential.
>
> Also FWIW, there's a TSB on the '05 model that too much grease can
> accumulate in the boot and cause a driveshaft imbalance condition,
> something to remember if you ever fix it yourself.
>
> In article <1185762014.273108.163480@x35g2000prf.googlegroups .com>,
> googlegroups@gersic.com says...
> > Hi all,
> >
> > I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
> > home from the dealer, I started noticing that sometimes when I stop,
> > as soon as I come to a full and complete stop, I get an extra little
> > lurch / bump. It's somewhat similar to the "bump stop" described in
> > TSB 030400, but I don't think that's it...partially because it's an
> > '04, which isn't covered under that TSB, and partially because it
> > happens immediately upon stopping, not a few seconds after, and it
> > never happens when I'm accelerating.
> >
> > Anybody have any idea what this could be? If it's powertrain-related,
> > I have a 30-day, 3k mile warranty that will get it fixed, but it would
> > help to have a good idea what the problem is when I go back to the
> > dealer, so they don't just tell me it's not any of the powertrain
> > components, and send me home...
> >
> > Thanks,
> > Tom
> >
> >
>

 

That should have read "WJ website". The URL is:

http://www.wjjeeps.com/jmenu.htm

In article <MPG.2118d9164d74dca99898d5@news.chi.sbcglobal.net >,
Sorry@nomail.com says...
> I recently had the bump/stop problem fixed on an '04 JGC 4.0/Selectrac I
> bought used and so far so good. The TSB summary I saw on the KJ website
> applies to V8 models and talks about replacing the driveshaft but it
> also contains a Note that on 4.0's the splines should be greased. The
> service writer I talked to said it was very common, doesn't hurt
> anything, and might come back eventually. They pulled the driveshaft and
> greased it in about half an hour. Mine is still under the 3/36 warranty
> so I don't know if the powertrain warranty covers it.
>
> Mine would only do it after a delay or on acceleration after very gentle
> stops, most of the time it happened as the rear end settled right at the
> end of a stop. One way to confirm it's the driveshaft is put it in
> neutral before you stop and see if it goes away. The service writer told
> me a similar problem is sometimes caused by a bad ball joint between the
> upper control arm and the top of the differential.
>
> Also FWIW, there's a TSB on the '05 model that too much grease can
> accumulate in the boot and cause a driveshaft imbalance condition,
> something to remember if you ever fix it yourself.
>
> In article <1185762014.273108.163480@x35g2000prf.googlegroups .com>,
> googlegroups@gersic.com says...
> > Hi all,
> >
> > I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
> > home from the dealer, I started noticing that sometimes when I stop,
> > as soon as I come to a full and complete stop, I get an extra little
> > lurch / bump. It's somewhat similar to the "bump stop" described in
> > TSB 030400, but I don't think that's it...partially because it's an
> > '04, which isn't covered under that TSB, and partially because it
> > happens immediately upon stopping, not a few seconds after, and it
> > never happens when I'm accelerating.
> >
> > Anybody have any idea what this could be? If it's powertrain-related,
> > I have a 30-day, 3k mile warranty that will get it fixed, but it would
> > help to have a good idea what the problem is when I go back to the
> > dealer, so they don't just tell me it's not any of the powertrain
> > components, and send me home...
> >
> > Thanks,
> > Tom
> >
> >
>

 

That should have read "WJ website". The URL is:

http://www.wjjeeps.com/jmenu.htm

In article <MPG.2118d9164d74dca99898d5@news.chi.sbcglobal.net >,
Sorry@nomail.com says...
> I recently had the bump/stop problem fixed on an '04 JGC 4.0/Selectrac I
> bought used and so far so good. The TSB summary I saw on the KJ website
> applies to V8 models and talks about replacing the driveshaft but it
> also contains a Note that on 4.0's the splines should be greased. The
> service writer I talked to said it was very common, doesn't hurt
> anything, and might come back eventually. They pulled the driveshaft and
> greased it in about half an hour. Mine is still under the 3/36 warranty
> so I don't know if the powertrain warranty covers it.
>
> Mine would only do it after a delay or on acceleration after very gentle
> stops, most of the time it happened as the rear end settled right at the
> end of a stop. One way to confirm it's the driveshaft is put it in
> neutral before you stop and see if it goes away. The service writer told
> me a similar problem is sometimes caused by a bad ball joint between the
> upper control arm and the top of the differential.
>
> Also FWIW, there's a TSB on the '05 model that too much grease can
> accumulate in the boot and cause a driveshaft imbalance condition,
> something to remember if you ever fix it yourself.
>
> In article <1185762014.273108.163480@x35g2000prf.googlegroups .com>,
> googlegroups@gersic.com says...
> > Hi all,
> >
> > I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
> > home from the dealer, I started noticing that sometimes when I stop,
> > as soon as I come to a full and complete stop, I get an extra little
> > lurch / bump. It's somewhat similar to the "bump stop" described in
> > TSB 030400, but I don't think that's it...partially because it's an
> > '04, which isn't covered under that TSB, and partially because it
> > happens immediately upon stopping, not a few seconds after, and it
> > never happens when I'm accelerating.
> >
> > Anybody have any idea what this could be? If it's powertrain-related,
> > I have a 30-day, 3k mile warranty that will get it fixed, but it would
> > help to have a good idea what the problem is when I go back to the
> > dealer, so they don't just tell me it's not any of the powertrain
> > components, and send me home...
> >
> > Thanks,
> > Tom
> >
> >
>

 

That should have read "WJ website". The URL is:

http://www.wjjeeps.com/jmenu.htm

In article <MPG.2118d9164d74dca99898d5@news.chi.sbcglobal.net >,
Sorry@nomail.com says...
> I recently had the bump/stop problem fixed on an '04 JGC 4.0/Selectrac I
> bought used and so far so good. The TSB summary I saw on the KJ website
> applies to V8 models and talks about replacing the driveshaft but it
> also contains a Note that on 4.0's the splines should be greased. The
> service writer I talked to said it was very common, doesn't hurt
> anything, and might come back eventually. They pulled the driveshaft and
> greased it in about half an hour. Mine is still under the 3/36 warranty
> so I don't know if the powertrain warranty covers it.
>
> Mine would only do it after a delay or on acceleration after very gentle
> stops, most of the time it happened as the rear end settled right at the
> end of a stop. One way to confirm it's the driveshaft is put it in
> neutral before you stop and see if it goes away. The service writer told
> me a similar problem is sometimes caused by a bad ball joint between the
> upper control arm and the top of the differential.
>
> Also FWIW, there's a TSB on the '05 model that too much grease can
> accumulate in the boot and cause a driveshaft imbalance condition,
> something to remember if you ever fix it yourself.
>
> In article <1185762014.273108.163480@x35g2000prf.googlegroups .com>,
> googlegroups@gersic.com says...
> > Hi all,
> >
> > I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
> > home from the dealer, I started noticing that sometimes when I stop,
> > as soon as I come to a full and complete stop, I get an extra little
> > lurch / bump. It's somewhat similar to the "bump stop" described in
> > TSB 030400, but I don't think that's it...partially because it's an
> > '04, which isn't covered under that TSB, and partially because it
> > happens immediately upon stopping, not a few seconds after, and it
> > never happens when I'm accelerating.
> >
> > Anybody have any idea what this could be? If it's powertrain-related,
> > I have a 30-day, 3k mile warranty that will get it fixed, but it would
> > help to have a good idea what the problem is when I go back to the
> > dealer, so they don't just tell me it's not any of the powertrain
> > components, and send me home...
> >
> > Thanks,
> > Tom
> >
> >
>

 

On Jul 31, 7:43 am, AJ <So...@nomail.com> wrote:
> That should have read "WJ website". The URL is:
>
> http://www.wjjeeps.com/jmenu.htm
>
> In article <MPG.2118d9164d74dca9989...@news.chi.sbcglobal.net >,
> So...@nomail.com says...
>
>
>
> > I recently had the bump/stop problem fixed on an '04 JGC 4.0/Selectrac I
> > bought used and so far so good. The TSB summary I saw on the KJ website
> > applies to V8 models and talks about replacing the driveshaft but it
> > also contains a Note that on 4.0's the splines should be greased. The
> > service writer I talked to said it was very common, doesn't hurt
> > anything, and might come back eventually. They pulled the driveshaft and
> > greased it in about half an hour. Mine is still under the 3/36 warranty
> > so I don't know if the powertrain warranty covers it.
>
> > Mine would only do it after a delay or on acceleration after very gentle
> > stops, most of the time it happened as the rear end settled right at the
> > end of a stop. One way to confirm it's the driveshaft is put it in
> > neutral before you stop and see if it goes away. The service writer told
> > me a similar problem is sometimes caused by a bad ball joint between the
> > upper control arm and the top of the differential.
>
> > Also FWIW, there's a TSB on the '05 model that too much grease can
> > accumulate in the boot and cause a driveshaft imbalance condition,
> > something to remember if you ever fix it yourself.
>
> > In article <1185762014.273108.163...@x35g2000prf.googlegroups .com>,
> > googlegro...@gersic.com says...
> > > Hi all,
>
> > > I just bought an '04 JGC 4.0 to replace my '97 JGC 4.0. After I got
> > > home from the dealer, I started noticing that sometimes when I stop,
> > > as soon as I come to a full and complete stop, I get an extra little
> > > lurch / bump. It's somewhat similar to the "bump stop" described in
> > > TSB 030400, but I don't think that's it...partially because it's an
> > > '04, which isn't covered under that TSB, and partially because it
> > > happens immediately upon stopping, not a few seconds after, and it
> > > never happens when I'm accelerating.
>
> > > Anybody have any idea what this could be? If it's powertrain-related,
> > > I have a 30-day, 3k mile warranty that will get it fixed, but it would
> > > help to have a good idea what the problem is when I go back to the
> > > dealer, so they don't just tell me it's not any of the powertrain
> > > components, and send me home...
>
> > > Thanks,
> > > Tom- Hide quoted text -
>
> - Show quoted text -

I am having the exact same issue on an 05 Wrangler 4.0. Here is my
little story - took it down to Hoosier National Forest for some off
roading. next day I noticed my air conditioner wouldn't switch from
blowing all defrost to my feet or face, no changes at all. I took a
look under the hood and noticed a tube running to the AC was
disconnected from the engine. I replaced the hose and the AC worked
fine. The next time I drove the Jeep, I noticed this engine surge.
It happens only at a full stop, and when the engine gets to about 700
or 800 RPM, it quickly jumps to about 1500 and the calms down. If I
go back under the hood and disconnect that hose again from the engine,
there is no more surge. Also, if I run the AC on max/recycle air, it
happens, but very very very little, almost would even notice.

I had a 97 Cherokee 4.0 and an 05 GC Hemi - never had any issues with
either of those vehicles.