RR CLASSIC LWB REAR VIBRATION

Ok hers a series of unusual events that i cannot make sense of
1. got a new tire on the rear passside at sams club and put it on.
got immediate bad vibration in the rear end thought bad balance job so
i took it back
2. put it on again
got immediate bad vibration so i took it back and got a new tire
3. put it on again
still vibrating so i poked around

ujoints looked good but i noticed an perfectly square rust spot next to
an existing balancing weight on the rear propshaft/driveshaft
4. i took the shaft off and drove the RR surprise no vibration so i
took the shaft to be balanced
put the shaft back on and STILL VIBRATING IN THE REAR END
5. JUST FOR PRACTICE...since i need practice working on the car...i
took the shaft off and changed the u joints...just in case

ITS STILL VIBRATING

SO WHY DOES IT NOT VIBRATE WITH THE SHAFT OFF? it makes sense to me
that the problem is in the shaft since the problem goes away when its
off. as i see it all the components that are in the rear end still turn
when the drive shaft is not pushing the car?
IDEAS?

MIKE wrote:
> Ok hers a series of unusual events that i cannot make sense of
> 1. got a new tire on the rear passside at sams club and put it on.
> got immediate bad vibration in the rear end thought bad balance job so
> i took it back
> 2. put it on again
> got immediate bad vibration so i took it back and got a new tire
> 3. put it on again
> still vibrating so i poked around
>
> ujoints looked good but i noticed an perfectly square rust spot next
> to an existing balancing weight on the rear propshaft/driveshaft
> 4. i took the shaft off and drove the RR surprise no vibration so i
> took the shaft to be balanced
> put the shaft back on and STILL VIBRATING IN THE REAR END
> 5. JUST FOR PRACTICE...since i need practice working on the car...i
> took the shaft off and changed the u joints...just in case
>
> ITS STILL VIBRATING
>
> SO WHY DOES IT NOT VIBRATE WITH THE SHAFT OFF? it makes sense to me
> that the problem is in the shaft since the problem goes away when its
> off. as i see it all the components that are in the rear end still
> turn when the drive shaft is not pushing the car?
> IDEAS?

It's probably not the shaft but some thing it's connected to. If no shaft is connected it free runs to
diff etc. if the shaft is driven then the diff input bearing & other things are 'driven' not allowed to
freely rotate with no centrifugal or other forces if you know what i mean.

Nighe


--

Subaru WRX
Range Rover 4.6 HSE (The Tank!)
110 Hi Cap (Ben)

'"Opinions are like arseholes, everyones got one"

Nige <[email protected]> uttered summat worrerz funny
about:
> MIKE wrote:
>> Ok hers a series of unusual events that i cannot make sense of
>> 1. got a new tire on the rear passside at sams club and put it on.
>> got immediate bad vibration in the rear end thought bad balance job
>> so i took it back
>> 2. put it on again
>> got immediate bad vibration so i took it back and got a new tire
>> 3. put it on again
>> still vibrating so i poked around
>>
>> ujoints looked good but i noticed an perfectly square rust spot next
>> to an existing balancing weight on the rear propshaft/driveshaft
>> 4. i took the shaft off and drove the RR surprise no vibration so i
>> took the shaft to be balanced
>> put the shaft back on and STILL VIBRATING IN THE REAR END
>> 5. JUST FOR PRACTICE...since i need practice working on the car...i
>> took the shaft off and changed the u joints...just in case
>>
>> ITS STILL VIBRATING
>>
>> SO WHY DOES IT NOT VIBRATE WITH THE SHAFT OFF? it makes sense to me
>> that the problem is in the shaft since the problem goes away when its
>> off. as i see it all the components that are in the rear end still
>> turn when the drive shaft is not pushing the car?
>> IDEAS?
>
> It's probably not the shaft but some thing it's connected to. If no
> shaft is connected it free runs to diff etc. if the shaft is driven
> then the diff input bearing & other things are 'driven' not allowed
> to freely rotate with no centrifugal or other forces if you know what
> i mean.
> Nighe

Owners manual says to stick the Diff lock on when jacking the vehicle... IF
it was put on it wasn't left on was it??? I'm assuming you had to put it on
to get drive for the test with the front prop only unless you have a RRC
with a viscous coupling in which case it could be the cupling thats failed.

Lee

On or around Tue, 14 Mar 2006 23:10:24 -0000, "Lee_D"
<[email protected]> enlightened us thusly:

>Owners manual says to stick the Diff lock on when jacking the vehicle... IF
>it was put on it wasn't left on was it??? I'm assuming you had to put it on
>to get drive for the test with the front prop only unless you have a RRC
>with a viscous coupling in which case it could be the cupling thats failed.

There's a mystery vibe on the disco here, too - replaced one of the front
UJs, which made much less vibe, but it still vibes a bit.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Chuck didn't reply, so George swung round in his saddle. He could just
see Chuck's face, a white oval turned toward the sky.
'Look,' whispered Chuck, and George lifted his eyes to heaven.
(There is always a last time for everything.)
Overhead, without any fuss, the stars were going out"
Arthur C. Clarke, "The 9 billion names of God"

"MIKE" <[email protected]> wrote in message
news:[email protected]...
> Ok hers a series of unusual events that i cannot make sense of
> 1. got a new tire on the rear passside at sams club and put it on.
> got immediate bad vibration in the rear end thought bad balance job so
> i took it back
> 2. put it on again
> got immediate bad vibration so i took it back and got a new tire
> 3. put it on again
> still vibrating so i poked around
>
> ujoints looked good but i noticed an perfectly square rust spot next to
> an existing balancing weight on the rear propshaft/driveshaft
> 4. i took the shaft off and drove the RR surprise no vibration so i
> took the shaft to be balanced
> put the shaft back on and STILL VIBRATING IN THE REAR END
> 5. JUST FOR PRACTICE...since i need practice working on the car...i
> took the shaft off and changed the u joints...just in case
>
> ITS STILL VIBRATING
>
> SO WHY DOES IT NOT VIBRATE WITH THE SHAFT OFF? it makes sense to me
> that the problem is in the shaft since the problem goes away when its
> off. as i see it all the components that are in the rear end still turn
> when the drive shaft is not pushing the car?
> IDEAS?
>
If you've got a rusty square next to a balance weight it looks like you have
lost a weight next to the other one. Try putting a jubilee clip round the
prop (easy to fit if you unscrew it completely) and tightening it with the
heavy bit (where it joins) over the rusty square and drive it to see if it
makes any difference. Fit more than one if necessary and move them about a
bit until you get it right.
If you can't sort it like this then take it for rebalancing to someone who
manufactures them or fit another prop.

HTH Martin