What is a Budget Boost (aka BB and spacer lift)?
A Budget Boost is an inexpensive(relatively speaking) way to lift a TJ. They are spacers, usually made of polyurethane, but can also be made of metal or rubber,that are placed above the stock TJ springs to increase height. They range in size from 1/4 inch to 2 inches. They are many times offered in a kit that include shocks and bump stop extensions with them.