BAG ON AXLE
BAG OVER AXLE
what do these mean??
and when i do the notch do i still use the rear part of the frame or do i build something else?
Same thing. The decision you need to make is bag over BAR or bag over AXLE. On my ranger, I had the bags over the upper bars. A lot of people put them over the axle, outside the frame, because the Ranger frame is so narrow that they fit outside. On the S10, the bags over axle would be placed inside the frame, because the S10 frame is significantly wider.
As far as the notch, you just need to make room for the axle when the truck lays out. It doesn't matter how you accomplish it as long as it is structurally sound and works well with the rest of the set up.
Here is mine, in it's final iteration, right before I sold it:
1 = c-notch and shock mount
2 = bags on bars
Note the triangular positioning of the upper 4 link bars. The triangle is the most structurally sound shape and in this situation, acts as a brace, keeping the axle centered. If you have a 2 link (2 bars only) or a parallel 4 link (4 bars, both running straight fore and aft) then you need a panhard bar, which acts as the centering device.
You also have to consider the length of the bars. Shorter bars will provide you with more stability but exaggerated wheel movement on lift and drop because of the short radius.
Longer bars will generally provide you with a more comfortable ride, due to the isolating nature of the longer distance between axle and frame. They will also tend to keep the axle centered with a consistent wheelbase.
So for a minitruck that will see a lot of lift, long bars are ideal.
Just to illustrate, my truck lost about 1.5" of wheelbase at full lift, because, as the body and frame lift up and away from the axle, the radius of the bar brings the axle forward. Longer bars are also better because they will reduce lateral torsion on the bag at full lift.
As for the A/C compressor, I have seen and heard of it being done. It can be a pretty involved procedure. You will need an external check valve, an external oiler, and a pressure switch. Also, it would be ideal if it was one made for the vehicle so it would bolt into place without having to make bracketry.
I tried it on my Ranger with an old compressor from an Aerostar. It bolted right into place on the 4.0L but the clutch was seized so I threw it out and bought Viair 450s lol.