even with an inch of drop, you need to do something about the lower control arm angle (lca relocation brackets) as well as an adjustable panhard rod to re-center the axle
it will be a harder ride too, lowering springs are stiffer than stock. good time to upgrade your shocks, or the rebound will suck. your factory shocks are probably toast anyway, making the problem worse
so, proper lowering job:
- lca relocation brackets
- trim air dam
- adj. panhard rod
- new shocks
- lowering springs
- alignment
lowering a solid rear axle car properly isn't cheap