Well, all the programmer can do is up the line pressure via the EPC solenoid. This is a partial solution. The accumulator springs need to be stiffer and the seperator plate needs to be drilled to allow more volume faster to apply the clutches. Adding more clutches per pack will increase surface area contact increasing holding capacity. Kinda like tubbing a narrowing the rear to get some 18" slicks under there---more contact patch = better traction. To have a good performing transmission you need to bring up the level on all those aspects---a well matched combination.
High pressure causes things to wear quicker. Not just the pump, anywhere else pressure is routed through, especially sealing rings.
Low pressure and volume will allow clutches to slip when attempting to apply. It wears the clutches faster, creates heat and pretty soon the clutches will get glazed over and then burnt. Holding power of the clutch pack is compromised and eventually nonexsistant.
They might be talking about the accumulator body. The valve body doesn't have much effect on the intensity of the shifts. The main valve body has more to do with sending the fluid to the correct places. The accumulator body is where the shift intensity is controlled. If you see a picture, the accumulator body is retangle. It is all the way up front right behind the filter tube.
Personally, I have never purchased a high performance V-B or Accu-B from a performance vendor. Where I live there isn't much high performance stuff going on. We've built some H-D diesel stuff choosing induvidule pieces and drilling the seperator plate to what we have found appropriate to the application. Some of these trucks would get sideways on the 1-2 shift and have a nice 2-3 and 3-4. There are shops that performance trans is their only focus and they maximise the holding capacity of the trans. But, not sure who to recommend.
If you want to make some moderate inprovements it isn't really a tremendous job to pull the valve body, accumulator body, solenoid and seperator plate. Then you can better match volume and pressures. The bad parts is, with just about any shift kit off the shelf they are going to want you to make mods to the pump, which is only accessable when the trans is out. If you are attempting to make some control mods yourself, I can send ya some info on where to drill and what to use.
