[William]

For the most part Z/28 'fast-ratio' steering was accomplished via linkage changes. The standard Z/28 setup used the production manual box with a longer pitman arm and shorter steering arms. So a manual gear with a 5.75" c-c pitman arm is technically a fast-ratio box but must be used with the appropriate steering arms.

It was possible to order N44 on a Z/28 and I believe that used the faster box also. But it is so fast and stiff even Trans-Am drivers complained about it back in the day. I was at Road America a few years ago and happened to be near the tent when the '69 Penske Camaro came back from the parade lap. With the car stopped the driver couldn't cut the wheels to back it into position. He shut it off and left it outside.