2.5" Frontend Lfit & CV Joint

Have a question for those who have put a 2.5" lift on, have you lowered your differential? I talked to a 4X4 store and they said the 2005 Tacoma with auto hubs are prone to have problems with their CV joints if they aren't lowered. I have read on various site that it really isn't necessary until you lift your frontend above 3". I am interested to findout what you all have done. Just wondering if the 4x4 shop what to get more money out of me.

As always thanks.