Hi,
I know this is an old forum. But hoping someone might still be active? Just wondering if anyone knows what the fix to this issue is? I’ve got a 2019 S90 D5 having the same issues when going up an incline around 1500rpm begins to judder/shake.
Thanks in advance
I’ve got it as well, in my 09 XC60 at 1500rpm with a bit of load on the gearbox.
I believe it’s a worn torque converter lock up clutch. Basically the lockup TQ is slipping which causes the shudder. If I go into manual gear selection, down shift so the rpm increases (ie reducing the load on the gearbox) the slipping stops
new torque converter needed. 
brett2019s90 Please post about your issue in a new thread instead of this 4-year-old one.
The 2019 S90 is nothing like an XC60.
jared244 What transmission does your XC60 have?
How many kays on it, and how often has the transmission oil been flushed?
TF-80SC, 180000km. Flushed at least twice. Last time was recently at the 180K service.
More related to/same symptoms as the original poster I guess.
jared244 Ah, the TF80SC rubber band....
It appears if these things supposedly "sealed for life" (HA!) don't get a flush before about 80K km from new, they're essentially stuffed by the time the owners notice they're starting to fail. Then owners sick of the hard shifts and banging get them flushed, the fluid emerges brown or black, but it's too late by then since the damage has been done. Not the owners fault when the stealers insist the transmissions never need fluid changes.....
Guessing that a valve body and possibly torque converter replacements are likely on the cards.
