It makes no difference... the transfer case isnt being driven off of the trannys ring gear like a conventiona 4x4, its being driven by an output shaft (basically the same place where your front axle would connects on a regular Focus) AND theres no gear reduction for the transfer case... so to keep everything in sync you would actually have to have a 1:1 ratio in the rear end.
[B]1951 McCormick FARMALL M
2007 MINI Cooper S Turbo... new project car
1998 Chevy 3500 Ext cab, long bed, 4x4, duelly, turbo diesel
2004 Harley V-Rod.... sex on wheels
2011 Harley Electra Glide Ultra Limited