I called Dr. Diff (Cass) regarding his 3.23 gear set for the Dana 60. After talking it over with him, and going with a 275/60 rear tire, this is probably my best decision. Keeping it simple. I'd love to have an overdrive and it may still happen if this doesn't satisfy my needs. But 2600 RPM's at 65 is probably good enough for the long cruises. Thanks everyone for your feedback!