Is there any difference between the S4 and S5 power steering rack? How about the inner and outer tie rods?

 

only that some of the S5 racks were 17:1 instead of 15:1 that was found on all the S4 power steering racks.

 

The 17.2:1 racks were in the GTU-S - so grab the tranny and diff while you're at it!

Another question that comes to mind is what kind of power steering? Vehicle speed sensitive units are three line racks (15:1 ratio), while engine speed sensitive units (which come in both 15:1 and 17.2:1 ratios) have two lines. The tie rods are all the same part number, FB01-32-240A, from 86 through 91.

 

No, they were on all the 91 non turbos, and some of the 90 non turbos as well

 

Which models came with the 2 line units?