We are adding the 3" so that we'll have less of the trans. right up at your feet and give a little more room for the engine. I figure I'll be able to get by with a little smaller trans hump so I'll have more room for my big feet... LOL
I went with trailer springs that are rated at 2500lbs for the pair with 3 leaves each, it was either that or 1000lbs single leaf. I thought that 1000lbs springs might not be quite enough, and figure I can pull one or two of the leaves off of my set if they end up being too stiff. I bounced on the back of the frame with the old springs and new springs and it seems to be about the same, but we'll see.
talk to you later