Doesn't matter if wheels are balanced recently. Could be bad tyres or bent rim(s). I had a vibrations you mentioned after fitting a brand new summer tyres. After fitment i had vibrations around 90km/h...2nd balance around 100km/h...3rd balance after 110km/h...4th balance around 120km/h. Balancing ma...

There are so many tyre shops which doesn't remove old weights before new balancing...they just add more if needed...resulting in bad vibrations which was hardly noticeable before balancing.
Now....i just visit one or two tyre shops because of that and avoid others.

Torque converter lockup will never be engaged in 1st gear, so it's not responsible for jerky starts.

aeg wrote: ↑01 Dec 2025, 14:32 Torque converter lockup will never be engaged in 1st gear, so it's not responsible for jerky starts.

I missed this , it’s great when the Collective Brain chimes in on a tough one. Thanks, @aeg

+1 on tires/rims Before I found a trustworthy tire shop, i would have a similar issue when changing tires or buying new ones. When my tire guy started his own shop, problem solved. I took my new tires <100 miles into him and he immediate spotted the issue described above. the tires were balanced wit...

It is not unusual to find how much better a car runs after some basic servicing. I laughed when my mechanic buddy commented how much his 850 AWD was running after swapping the plugs and rotor/distributor cap. Oh, he was a Volvo tech for about 15 years...........

Neil.

Regarding the transmission, if the fluid change doesn't help and it shifts weird/hard, you can also try to replace the TCU with a another used one. Mine had failed and it was still working, but acting strange for a long time, before it finally caused a code.