[cleszkie]

1) That I couldn't tell you. I just hunted down a 4x4 version, but had to do the output shaft "update" to het the 10-spline output.

2) I have never personally seen a close ratio version, or know of the correct casting numbers to look for. I have only seen and dealt with the wide ratio versions. For that matter, perhaps there is no close ratio version. I was only assuming that there might be one out there. A quick google search would answer this question.

4) My pedal assemble has two springs - a heavy one and a light one. They both work together, along with the long return spring under the truck between the frame rail and the clutch fork. I am not aware of any other variations.

5) I imagine that GM only produced one clutch pedal assembly and had multiple z-bar assemblies to make it work with many applications. So your 2x4 pedal assembly should be good for a 4x4.