my 2010 Outback occasionally squeals and lurches at 45 mph and higher.

Hello, "shift OK" is an interesting statement with a CVT, so I'm honestly not sure what you mean. The CVT is continuously variable with gears - meaning there is no shifting. Do you mean shifting from Park to Reverse or Drive positions? Where does the squeal come from when you hear it? Under the hood? Under the vehicle? When you say it lurches, do you mean that it surges and hesitates? This could be an engine performance issue or perhaps a transmission issue. It's way too difficult to discern in this forum; I'd highly suggest having an assessment at a trusted shop near you. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.