I just thought of another way to look at this. After you invest in your suspension, you can do miscellaneous things to add performance for low cost: Lighten the truck be removing unnecessary smog components, brackets, unused mounts, all that junk in your glove box, and also install Denso Iridium plugs, advance your timing + run better gas, upgrade to a better flowing air filter, et cetera, all of which are simple time and monetary investments. Reducing some weight would be most beneficial in this regards and it's free too.
Compare this to investing in your engine, then what sort of miscellaneous things could you do to improve the stock suspension? Really not much. I suppose you could remove a leaf or two from each spring pack, which is a free modification that would provide a reduced spring rate, but the stock springs are so flat to begin with I think this would worsen the ride quality. You could remove the stock sway bar, another free modification, which would improve ride comfort but at the expense of stability. If you have a torch and a welder, you could reposition your rear shackle hanger forward on the frame about an inch and then run some longer rear shackles (a small investment), but you'd still be stuck with stock springs... Our urethane body mount kit would reduce vibrations in the cab but it won't help out flat stock springs...
I hope you can see what I'm trying to describe.
Cya,
BigMike
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