As a rule the Sierra was fitted with a manual steering rack. The threads on the track rods is M14 X 2
The XR & 2 Litre DOC Sierra came with power steering & I believe it was an option on other models.
Chris has stated that the Sierra rack is not suitable to use without modification.
It is not a simple matter of altering the length of track controll arms. The problem lies in the rack & pinnion section of the rack, it is too long & needs to be shortened by having it machined.
I had rack extensions made to the book speck & found that they needed to be shortened by 30mm each.
Lucky for me that they had a deep enough bore for me to tap a deeper thread ( M14X2 )
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