Mears does run a shuttle bus between the Disney resorts and Universal. But, it has to be prearranged and it will cost about $15 per person. You could check out the Mears website and see what the deal is.
Otherwise, you could rent a car or book a towncar service. Towncars cost about $65 roundtrip, for up to 4 people.
I am closing this thread since we already have one regarding this issue, by the same poster. Please feel free to post on the other thread.