Originally Posted by
shakespeare
Welcome mate and congrats on your purchase. First thing to check is tyre pressures, second is are all 4 tyres the same! Reason being is that with the AWD a difference in the diameters of the tyres particularly rears left/right will cause some drivetrain knocks and noises on deceleration, also front to rear size differences will also produce knocks and vibrations.
Try that first then have a look through the Tech Talk area which contains a number of diff related threads which may help you. A number of members have lowered MPS 6's without problems so it may not be that.
rayd, hello and welcome to the forum. Shakespeare got it right in one I reckon. I had a similar prob with my '05 MPS6, vibration on deceleration just as you describe. My local mazda dealer (REGAL MAZDA Newcastle.... I cant say enough good things about them) went to EXTREME lengths to chase down the problem. It turned out to be Yokohamas on the front and Toyos on the back that were causing the problem.
Although both pairs of tyres were 225/40R18's and ostensibly the same size they must in fact have different rolling diameters or different coefficients of friction. The rear diff (because the car is not constant 4WD) was basically going "I'm slipping, I'm gripping, I'm slipping... " and causing the vibration you mention.
If you can, try to borrow a set of identical wheels and tyres that fit your car and take it for a drive. I think you will find your problem will be solved.
Good luck with it,
Leon
Started out with nothing Still got most of it left