You don't mention how many miles, and when (or if) you last changed the transmission fluid. With a 2007, I'm guessing you have over 100k miles, and since Volvo doesn't recommend it, many people don't change the fluid. My experience is that it does need to have the fluid changed, and it sounds like y...

- According to IPD's website you should have a TF80SC Transmission. I have been wanting an XC90 for sometime and in my research found that after a certain VIN number during the 2007 production year the transmission and balance shaft problems of the V8's were addressed. Not sure about yours, however ...

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The is on a different transmission but is a comprehensive video of what needs to be done when you buy a Transgo Kit to rebuild the solenoid in the valve body and why sometimes a reman valve body does not work out of the box.