The Caddy gets the Haldex AWD system...more information directly from Haldex...
http://www.haldex.com/en/global/applications--products/Product-categories/AWD/AWD-Club/FAQ/
If I remember correctly (?) 10% to the rear all time...increases based on wheel slip
http://www.haldex.com/en/global/applications--products/Product-categories/AWD/AWD-Club/FAQ/
If I remember correctly (?) 10% to the rear all time...increases based on wheel slip