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GTUs power steering pump

Does the GTUs use the vehicle speed sensing or the engine speed sensing power steering pump? I've searched and found dissenting answers.

Quote:

Originally Posted by Icemark

The steering was engine speed sensing, not vehicle speed sensing and used the 17.1 rack (just like the InfiniIV and 91 'vert).

Quote:

Originally Posted by RETed

3-port is speed-sensitive power steering; these are only on the Turbo II's and "GTUs" models.
Everything else is 2-port or engine-sensitive PS.

BTW, the extra port is for bleeding the pressure off by the PS computer as the speed gets higher.

-Ted

Also, is there any difference in the steering racks, or belts(or anything...) that would make them non-interchangable?

Bump- I'm going junkyard hopping today, anyone know?

The pump cores are the same, but the valve & tank accessories are different.
Also the control box under the dash near the steering column is different.

According to Mazda I was wrong, but on all the GTUs models I have seen, they were engine speed sensing.

The pump/valve assemblies are different. The vehicle speed sensing assemblies have 3 lines, while the engine speed sensing assemblies have two lines.