a re and re of the springs is definitely a diy program. I have worn out/ broke four different complete sets of springs. I like to do one side at a time, I found the bushings come out easily, sometimes too easy .

if you want to re ark the springs you will have a lot of hammering in your future...... my manual says the springs are chromoly...... a lot of hammering.
I would find some better leaves, get new U bolts and center pins. if the bushings and pins are not severely worn and if the truck see's any kind of off road don't replace them till you have too. they only last me 8000 miles.

IF the bushes in the spring eyes get too thin it can cause the eye to distort and become oval. this will not be apparent till after the new bush is installed and you go to put the new pin in and it doesn't fit. easy cure if you have an adjustable reamer or a long procedure with a round file.
adding a regular spring steel leaf will not last and may cause neighboring springs to break.
inspect all the spring hangers for lose rivets, cracks, side wear and ovaling of the drivers side front spring hanger as it gets pounded the most.
upon reassembly do not over tighten spring pins to make up for any side clearances.
N1VSM wrote:My truck has always had a distinctive lean towards the passenger side
this is most likely due to the shims on the drivers side to compensate for the weight of the spare tire hanging off the door. the shimmy is likely due to worn/frost damaged tie rod ends, knuckle bushes/ bearings, affecting camber caster and/or toe.