I have a 1997 Jeep Grand Cherokee Limited w/ 55,000 miles, up country
suspension.

This vehicle is NOT driven daily, perhaps once every two weeks.

I had the transmission flushed and refilled at about 52,000

Last night while cruising on the highway at about 60 mph, the transmission
"shifted" once very hard, so much that my passenger noted and asked what was
wrong with the vehicle.

This has happened maybe 3 times previously within the past two months, at
highwasy speed and at low speed around the city.

Any ideas of what could be going on?

 

You folks need to replace your VSS (Vehicle Speed Sensor) before
your transmission eats itself. The VSS is what tells the computer how
fast the vehicle is going... when it lies, all hell can break loose. Should
have popped a code... have them checked.
__
Steve
..

"Howard" <nospamets@quadnet.net> wrote in message
news:4337c03f.0309081204.61772315@posting.google.c om...
> You are not alone. I have a 97 GC Orvis with V*, Up Country, trailer
> tow. I get the same surprise shift about every three of four days.
> Its a daily driver, long on weekends and short trips during the week.
> Been happening for about a year, nothing ill (yet). Both at highway
> speed and also the 1-2 shift.
>
> It almost seems like the trans can't make up its mind whether to go
> into overdrive or not.
>
> Its due in for service in late October and I'll have it checked then.
>
> > I have a 1997 Jeep Grand Cherokee Limited w/ 55,000 miles, up country
> > suspension.
> >
> > Last night while cruising on the highway at about 60 mph, the
transmission
> > "shifted" once very hard, so much that my passenger noted and asked what
was
> > wrong with the vehicle.
> >
> > This has happened maybe 3 times previously within the past two months,
at
> > highwasy speed and at low speed around the city.
> >
> > Any ideas of what could be going on?

 

You folks need to replace your VSS (Vehicle Speed Sensor) before
your transmission eats itself. The VSS is what tells the computer how
fast the vehicle is going... when it lies, all hell can break loose. Should
have popped a code... have them checked.
__
Steve
..

"Howard" <nospamets@quadnet.net> wrote in message
news:4337c03f.0309081204.61772315@posting.google.c om...
> You are not alone. I have a 97 GC Orvis with V*, Up Country, trailer
> tow. I get the same surprise shift about every three of four days.
> Its a daily driver, long on weekends and short trips during the week.
> Been happening for about a year, nothing ill (yet). Both at highway
> speed and also the 1-2 shift.
>
> It almost seems like the trans can't make up its mind whether to go
> into overdrive or not.
>
> Its due in for service in late October and I'll have it checked then.
>
> > I have a 1997 Jeep Grand Cherokee Limited w/ 55,000 miles, up country
> > suspension.
> >
> > Last night while cruising on the highway at about 60 mph, the
transmission
> > "shifted" once very hard, so much that my passenger noted and asked what
was
> > wrong with the vehicle.
> >
> > This has happened maybe 3 times previously within the past two months,
at
> > highwasy speed and at low speed around the city.
> >
> > Any ideas of what could be going on?

 

What does the tach do when this happens?? if it drops to zero, or close to
it, your cps maybe on its way out too, Most definitely go see the
stealership as soon as possible and have them check for codes..

Snow...

"Howard" <nospamets@quadnet.net> wrote in message
news:4337c03f.0309081204.61772315@posting.google.c om...
> You are not alone. I have a 97 GC Orvis with V*, Up Country, trailer
> tow. I get the same surprise shift about every three of four days.
> Its a daily driver, long on weekends and short trips during the week.
> Been happening for about a year, nothing ill (yet). Both at highway
> speed and also the 1-2 shift.
>
> It almost seems like the trans can't make up its mind whether to go
> into overdrive or not.
>
> Its due in for service in late October and I'll have it checked then.
>
> > I have a 1997 Jeep Grand Cherokee Limited w/ 55,000 miles, up country
> > suspension.
> >
> > Last night while cruising on the highway at about 60 mph, the
transmission
> > "shifted" once very hard, so much that my passenger noted and asked what
was
> > wrong with the vehicle.
> >
> > This has happened maybe 3 times previously within the past two months,
at
> > highwasy speed and at low speed around the city.
> >
> > Any ideas of what could be going on?

 

What does the tach do when this happens?? if it drops to zero, or close to
it, your cps maybe on its way out too, Most definitely go see the
stealership as soon as possible and have them check for codes..

Snow...

"Howard" <nospamets@quadnet.net> wrote in message
news:4337c03f.0309081204.61772315@posting.google.c om...
> You are not alone. I have a 97 GC Orvis with V*, Up Country, trailer
> tow. I get the same surprise shift about every three of four days.
> Its a daily driver, long on weekends and short trips during the week.
> Been happening for about a year, nothing ill (yet). Both at highway
> speed and also the 1-2 shift.
>
> It almost seems like the trans can't make up its mind whether to go
> into overdrive or not.
>
> Its due in for service in late October and I'll have it checked then.
>
> > I have a 1997 Jeep Grand Cherokee Limited w/ 55,000 miles, up country
> > suspension.
> >
> > Last night while cruising on the highway at about 60 mph, the
transmission
> > "shifted" once very hard, so much that my passenger noted and asked what
was
> > wrong with the vehicle.
> >
> > This has happened maybe 3 times previously within the past two months,
at
> > highwasy speed and at low speed around the city.
> >
> > Any ideas of what could be going on?

 

Or...

Did you bring it to a Jiffy Lube or quick oil change place and they talked you
into changing the transmission fluid because it's time to do so?

They change the transmission fluid when it's hot (you just drove there, and
they do changes quick), which means the transmission metal workings are hot.
When the fluid is hot it flows out quicker also. Then they pour some cold new
fluid in there on the hot metal. The metal doesn't like the quick temp change
and contracts quickly and unevenly. Then it nevers shifts right ever again.
I had it happen to 2 Firebirds, so I made sure they didn't talk me into it on
the Jeep. Yes it takes longer to do when the tranny is cold... but I hate the
way my Firebirds sound when shifted now.

Just say no to upselling!

 

Or...

Did you bring it to a Jiffy Lube or quick oil change place and they talked you
into changing the transmission fluid because it's time to do so?

They change the transmission fluid when it's hot (you just drove there, and
they do changes quick), which means the transmission metal workings are hot.
When the fluid is hot it flows out quicker also. Then they pour some cold new
fluid in there on the hot metal. The metal doesn't like the quick temp change
and contracts quickly and unevenly. Then it nevers shifts right ever again.
I had it happen to 2 Firebirds, so I made sure they didn't talk me into it on
the Jeep. Yes it takes longer to do when the tranny is cold... but I hate the
way my Firebirds sound when shifted now.

Just say no to upselling!

 

Mark12211 wrote:
> Or...
>
> Did you bring it to a Jiffy Lube or quick oil change place and they talked you
> into changing the transmission fluid because it's time to do so?

> Just say no to upselling!

Just say no to Jiffy Screw^WLube.
They put on my dads oil drain bolt so damn tight
it bent my breaker bar and took an airchistle to
get it out.

They also let a cowerker drive off without any
oil at all. Took a lawyer to get them to replace
the engine. They claimed that "it wasn't seized
that badly"

--
DougW

 

Mark12211 wrote:
> Or...
>
> Did you bring it to a Jiffy Lube or quick oil change place and they talked you
> into changing the transmission fluid because it's time to do so?

> Just say no to upselling!

Just say no to Jiffy Screw^WLube.
They put on my dads oil drain bolt so damn tight
it bent my breaker bar and took an airchistle to
get it out.

They also let a cowerker drive off without any
oil at all. Took a lawyer to get them to replace
the engine. They claimed that "it wasn't seized
that badly"

--
DougW

 

"DougW" <post.replies@invalid.address> wrote in message
news:8jb7b.788$8o3.754@news2.central.***.net...
> They claimed that "it wasn't seized
> that badly"
>

I think that says it all...