hi m8,focus ones mount differently for start,and have cable,not all of them though,this is easily changed though as both gearsets are exacly tha same,the difference is coice of three different final drives,as i found out by stupidly fitting a 4.1 final drive instead of the 3.8 i have been using and was used to,back to 3.8 now though.but i would say driveshaft setup is a big part to play,equal length is night and day in my car,tried both ways over winter,just to know for myself and anybody that wants my opinion if all these theries and old wifes tales were true,as i say thats my opinion and it works very well for me,oh and geometry is key facter to.