Parrothead Mike wrote:
Welcome guinny. If you aren't sure about I-75 there aren't many alternatives if you're through Ohio. About the only other option you have might be to cut over to Louisville via I-71 or I-64 to I-65 and go down through Nashville and cut back on I-24 to Atlanta & hook back up to I-75. Or you can go south through Montgomery, Alabama to US231 down to I-10.
From my side of Michigan we use I-65 through Louisville, Nashville, and Montgomery. It's is much flatter than I-75, although the main elevation issues you will face on I-75 will be in southern KY and northern TN. Take it at your own pace. If it's slippery, pull over somewhere until the sun warms the road surface.
Safe travels!
That route will take you over Mount Eagle. Bigger grade.
Could also go from I-65 to I-40 to I-75. Only one 5% grade on I-40 Cumberland Plateau, Crossville. No big deal.