vibration removing rear drive shaft

I have a small vibration and want to try to solve the problem. It only
occurs from 90 to 100km then stops. There is a vibration in the gas
pedal and seat. I want to remove the rear drive shaft and take the
jeep out to see if this is the problem. Is it safe to drive with out
the rear drive shaft - put the jeep TJ 2002 in 4x4 and drive in front
wheel drive? I have SYE. If this does not do the trick then I will
try the front but this is a lot more work!

I had that problem on our XJ and turned out to be a bad tire. Belt was
busted. Had vibs up at 90KPH...was good just before and after. Its pretty
simple check...maybe you have a wheel out of balance. Knock off a weight???

> wrote in message
oups.com...
> I have a small vibration and want to try to solve the problem. It only
> occurs from 90 to 100km then stops. There is a vibration in the gas
> pedal and seat. I want to remove the rear drive shaft and take the
> jeep out to see if this is the problem. Is it safe to drive with out
> the rear drive shaft - put the jeep TJ 2002 in 4x4 and drive in front
> wheel drive? I have SYE. If this does not do the trick then I will
> try the front but this is a lot more work!
>

Depending how high you are, your front driveshaft my vibrate worse. The
front driveshaft should not rotate in 2wd.

Carl



> wrote in message
oups.com...
>I have a small vibration and want to try to solve the problem. It only
> occurs from 90 to 100km then stops. There is a vibration in the gas
> pedal and seat. I want to remove the rear drive shaft and take the
> jeep out to see if this is the problem. Is it safe to drive with out
> the rear drive shaft - put the jeep TJ 2002 in 4x4 and drive in front
> wheel drive? I have SYE. If this does not do the trick then I will
> try the front but this is a lot more work!
>

I have driven home from a run at 55 mph and around for the week only on
the front driveshaft. Just remember not to goose it when the steering
is cranked over.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

wrote:
>
> I have a small vibration and want to try to solve the problem. It only
> occurs from 90 to 100km then stops. There is a vibration in the gas
> pedal and seat. I want to remove the rear drive shaft and take the
> jeep out to see if this is the problem. Is it safe to drive with out
> the rear drive shaft - put the jeep TJ 2002 in 4x4 and drive in front
> wheel drive? I have SYE. If this does not do the trick then I will
> try the front but this is a lot more work!

He has a TJ, the front shaft turns all the time.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Carl wrote:
>
> Depending how high you are, your front driveshaft my vibrate worse. The
> front driveshaft should not rotate in 2wd.
>
> Carl
>
> > wrote in message
> oups.com...
> >I have a small vibration and want to try to solve the problem. It only
> > occurs from 90 to 100km then stops. There is a vibration in the gas
> > pedal and seat. I want to remove the rear drive shaft and take the
> > jeep out to see if this is the problem. Is it safe to drive with out
> > the rear drive shaft - put the jeep TJ 2002 in 4x4 and drive in front
> > wheel drive? I have SYE. If this does not do the trick then I will
> > try the front but this is a lot more work!
> >

My mistake.. is this the same on YJ? I drove on my front shaft for a week
after I sprung-over. Terrible vibes above 40mph in 4HI (which was
front-drive). No vibes in 2HI (rear drive).

Carl


"Mike Romain" > wrote in message
...
> He has a TJ, the front shaft turns all the time.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Carl wrote:
>>
>> Depending how high you are, your front driveshaft my vibrate worse. The
>> front driveshaft should not rotate in 2wd.
>>
>> Carl
>>
>> > wrote in message
>> oups.com...
>> >I have a small vibration and want to try to solve the problem. It only
>> > occurs from 90 to 100km then stops. There is a vibration in the gas
>> > pedal and seat. I want to remove the rear drive shaft and take the
>> > jeep out to see if this is the problem. Is it safe to drive with out
>> > the rear drive shaft - put the jeep TJ 2002 in 4x4 and drive in front
>> > wheel drive? I have SYE. If this does not do the trick then I will
>> > try the front but this is a lot more work!
>> >

No, the YJ's have the vacuum disconnect so the driveshaft stays put when
in 2 WD. Same for the CJ's with their manual disconnects and at least
the first version of the 'new' XJ also have a vacuum disconnect.

Those vibes over 40 in 4 high are not normal. That implies a bad
u-joint either in the driveshaft or in the axle ends. You should be
smooth as silk all the way up to at least 70 mph in 4 high.

I use it in both my Jeeps at full highway speed in snow squalls. If I
am driving along at 65 mph and see snow on the road ahead, I just shift
into 4 high and keep on truckin'. See dry ahead and shift back to 2
HI. I always lock my CJ7 up before going on the highway in those kind
of conditions.

Mike

Carl wrote:
>
> My mistake.. is this the same on YJ? I drove on my front shaft for a week
> after I sprung-over. Terrible vibes above 40mph in 4HI (which was
> front-drive). No vibes in 2HI (rear drive).
>
> Carl
>
> "Mike Romain" > wrote in message
> ...
> > He has a TJ, the front shaft turns all the time.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Carl wrote:
> >>
> >> Depending how high you are, your front driveshaft my vibrate worse. The
> >> front driveshaft should not rotate in 2wd.
> >>
> >> Carl
> >>
> >> > wrote in message
> >> oups.com...
> >> >I have a small vibration and want to try to solve the problem. It only
> >> > occurs from 90 to 100km then stops. There is a vibration in the gas
> >> > pedal and seat. I want to remove the rear drive shaft and take the
> >> > jeep out to see if this is the problem. Is it safe to drive with out
> >> > the rear drive shaft - put the jeep TJ 2002 in 4x4 and drive in front
> >> > wheel drive? I have SYE. If this does not do the trick then I will
> >> > try the front but this is a lot more work!
> >> >

It's got new u-joints. I think the angle of the driveline is too severe for
above 40mph... I have about 8" of lift on a stock front driveline. No t-case
drop.

Carl

"Mike Romain" > wrote in message
...
> No, the YJ's have the vacuum disconnect so the driveshaft stays put when
> in 2 WD. Same for the CJ's with their manual disconnects and at least
> the first version of the 'new' XJ also have a vacuum disconnect.
>
> Those vibes over 40 in 4 high are not normal. That implies a bad
> u-joint either in the driveshaft or in the axle ends. You should be
> smooth as silk all the way up to at least 70 mph in 4 high.
>
> I use it in both my Jeeps at full highway speed in snow squalls. If I
> am driving along at 65 mph and see snow on the road ahead, I just shift
> into 4 high and keep on truckin'. See dry ahead and shift back to 2
> HI. I always lock my CJ7 up before going on the highway in those kind
> of conditions.
>
> Mike
>
> Carl wrote:
>>
>> My mistake.. is this the same on YJ? I drove on my front shaft for a week
>> after I sprung-over. Terrible vibes above 40mph in 4HI (which was
>> front-drive). No vibes in 2HI (rear drive).
>>
>> Carl
>>
>> "Mike Romain" > wrote in message
>> ...
>> > He has a TJ, the front shaft turns all the time.
>> >
>> > Mike
>> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> > 88 Cherokee 235 BFG AT's
>> >
>> > Carl wrote:
>> >>
>> >> Depending how high you are, your front driveshaft my vibrate worse.
>> >> The
>> >> front driveshaft should not rotate in 2wd.
>> >>
>> >> Carl
>> >>
>> >> > wrote in message
>> >> oups.com...
>> >> >I have a small vibration and want to try to solve the problem. It
>> >> >only
>> >> > occurs from 90 to 100km then stops. There is a vibration in the gas
>> >> > pedal and seat. I want to remove the rear drive shaft and take the
>> >> > jeep out to see if this is the problem. Is it safe to drive with
>> >> > out
>> >> > the rear drive shaft - put the jeep TJ 2002 in 4x4 and drive in
>> >> > front
>> >> > wheel drive? I have SYE. If this does not do the trick then I will
>> >> > try the front but this is a lot more work!
>> >> >

I had a small vibration in the gas pedal and steering wheel on my 93 YJ -
replaced both U-joints on the rear axle (relatively inexpensive and easy)
found that just 1 bearing cap was bad,,,, vibration went away.

My recommendation is if you are going to drop the drive shaft, just replace
the u-joints (greasable) and let er rip!


> wrote in message
oups.com...
>I have a small vibration and want to try to solve the problem. It only
> occurs from 90 to 100km then stops. There is a vibration in the gas
> pedal and seat. I want to remove the rear drive shaft and take the
> jeep out to see if this is the problem. Is it safe to drive with out
> the rear drive shaft - put the jeep TJ 2002 in 4x4 and drive in front
> wheel drive? I have SYE. If this does not do the trick then I will
> try the front but this is a lot more work!
>