Yes, to change from 2.93 overall to 3.29 overall, you would swap the input chain sprockets for ones with the same number of teeth, most commonly found in the non-HD trans. AFAIK, the HD diff only came in 3.29, so there's no choices on that end, I'm afraid. Well, I don't know that anyone's tried swapping the sun gear/planetary gears from a non-HD diff into an HD diff, so it could be possible, and I think was mentioned on this site at one point, but who knows.