need help from the suspension experts

[weldvair@embarqmail.]

I just drove my newly almost finished 48 GMC. I am experiencing bump steer
In the rear(I think).

I using Chrysler 5th ave station wagon springs. They are 60" long
& they are mounted so that the rear of the spring is 5' higher than the
front. I am assuming that this is causing the spring to move forward
when hiting a bump, thus moving the rear of the truck sideways.

What would you recommend doing.....1.) moving the rear chackles down
2-3" or so, thus raising the rear of the truck 1 1/2"......don't really want
to do that.
2). buy shorten springs from a vender that have are flatter.
3.) buy a coil over kit- 4 bar
4.) other

Thanks Don