Sierra Cosworth 4x4 Diff Ratio Question
Front or rear diff, and why do you need to know this? (as I'll have to tke a cover off one to count them), maybe I can give you advice without doing this ?
Obviously you must use the same Front and Rear on a 4X4 Car.
There is a 3.9 ratio which is from the 2.0 Sierra 4X4 which I am using in my Puma 4X4
Front 3.9's are getting hard to find now 
HTH Dave
Obviously you must use the same Front and Rear on a 4X4 Car.
There is a 3.9 ratio which is from the 2.0 Sierra 4X4 which I am using in my Puma 4X4
HTH Dave
The reason I ask is I am doing a 4x4 conversion on a MK5 cortina and I am thinking about using the original rear axle and a quaife ATB diff. So I am trying to find on the teeth on the pinion and crown wheels on a 4x4 cossie diff so I can get an identical set for the atlas diff.
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