When our trucks are at stock height the tie rods angle down to the spindles. When you cut the springs they angle up much further making your toe angle get really extreme since the tie rods push out. Try running with your toes pointe to the side kinda hard right? So that squealing is from your tires tring to turn right on the right side and left on the left side. They are fighting each other as your driving which vastly increases your rolling resistance this is why it isn't accelerating for beans.
When I got my truck someone had cut the springs to get a 5 inch drop with no spindles. Which resulted in a horrible ride on the bumps stops and horrible toe out. So they aligned it and brought the alignment back in spec the dealer put in three inch lowering springs and raised the front back up but that brought my toe angle way way in a a result and it never got re aligned. Before I knew much about suspension my truck just ate the front tires up. So take a like at the inside an outside of your tires. They should be even with no feathered edges or rubber eraser dust substance.
My before and after 45* is pretty bad.
My specs are pretty harsh for normal driving. 13* toe out with low profile tires would be great and -.5 camber is a good place to start get as much caster as you can. 7.5* was about the most the can get with mine with the specs I provided but I also have an inch forward on my lca's
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