[Stepside]

Any unsprung weight removal will noticably improve acceleration.
Lightened trailing arms are a must, if you're racing. One of the first things we do on our modified. Properly lightening these arms is the trick. We lighten in non-stress areas, add support to the stress points. Depending on where those slots are, what your purpose is for this truck, all plays a part. Slotting the entire length, is new to me. I'd have to see a pic.
Stepside