Volvo 850 hard nut vibrates/trimmers from 140

Meals all together; my 850 BJ.95 144ps drives me crazy. At Km stood 600,000 the old bag began to trembl like a chilly dog. Feels it comes from the rear axle, but that doesn’t mean anything. My lack is for 23 years the main professional Volvo mechanic for the models up to V70/2. I have already renewed and I mean new and not needed and the parts are either Ori parts or well-known zub and max 1000km old. Shock absorbers front and rear side handlebars front L enkung complete All 4 wheel bearings Brake Discs/pads/saddles/sleeps All engine bearings also the cushion axle shafts Time to try another automatic built-in, which is not new but ok All 4 springs rear axle bushings outside 4 summer tyres(hankook) new , rims without tires tested for unbalance/beat With 2 other set wheels exactly the same So until the inner rear axle bushings everything is renewed Up to 130 completely quiet, from 135 becomes crawly, at 140 the rear mirror is a shaking plate “At 145 you get the bit out of your face Ach and the vibration damper I also replaced with a new one. I really didn’t have any ideas anymore and well, slowly enough knatter sunk in the car….but I just love it. I bought it with 389,000 2018 and never had problems,only worn parts renewed like the previous owner too. Maybe who else has a idea, otherwise I don’t drive faster than 132…? L.g Olly