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[ffcgary1]

Does the vibration change at different speeds and does it occur at a certain speed, and dissaapear at a set speed.?

[pete220]

i have this strange vibration on my 3.0 mv6 seems to come from the prop but only does it when backing off the gas between 60 mph to 50 mph but if i dip the clutch it stops it

[manolo]

it occurs only in 1 and 2 speed entering and exit roundabout, or when uphill start and turn left or right
when it happens reducing the acceleration it disappears
when accelerate straight and at higher speed there is no problem

[ffcgary1]

i wonder if this is more related to the diff half shafts rather than gearbox, propshaft, coupler.
From the discription sounds like the shudder is when the car is turning either r/l and underload
so could be the joint on the half shaft.
Does the car have a LSD DIFF?

[manolo]

don't know about LSD diff
and don't believe that balance weight is wrong
what You mean by  joint on the half shaft???

[ffcgary1]

from the rear diff on either side of the car is a drive shaft, and at each end of the drive shaft is a universal joint with a rubber gaitor on it, these are the joints that allow flex of the suspension whilst the car travels forward and the suspension travels up and down.
Check the condition of these joints for slopyness and also the rubber gaitors for splits and tears, if split then the grease may have leaked out and road dirt and salt may have entered the joint and caused damage.Other than that then I dont know how else to help you, perhaps someone else may have an idea.

[ffcgary1]

Have you checked wheel bearings and wheel nuts for correct tightness, also worth checking conditon of front wishbone bushes and lower swivel joints as well.

[manolo]

1th mehanicar suspect to universal joints and lose clamp on rubber boots and oiled it. No difference in vibration but I think it could bee problem, will check again
all wishbone bushes (4 front and 2 rear) are new


TX
ffcgary1 

[manolo]

Find cose of vibration
It is up wishbone bush on carrier of diff
Anybody now the GM no.?

[biggriffin]

think its this one 90447156 diff carrier bush upper.

arm bush rear 90223456
arm bush front 90334925
anti roll bar bush rear 90373771

[manolo]

[manolo]

no, it was not wishbone bush.
problem was some plate in diff, don't know name  but here is pic that i found on net (not from Omega)


seams that the plate is acting as spring and after time of usage is aligned
on the press we warp out centre
now i have no vibration, but don't know how long it will be OK

on the automotive hoist
before > when turning one wheel  other one was standing still
now > when turning one wheel other one is turning in the same direction

think now I should have better traction, will know after few days testing

[manolo]

if somebody need
http://www.partsbase.org/opel/omega-b-1994-2003-13-3-8-1-differential-case-rear-axle-with-limited-slip-differential/