lowering on a budget

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I wasn't able to locate a thread with my particular problem I have a 71 c-10 that I have 2 1/2" drop spindles that I want to install. I also plan on lowering the rear about 4". Ive read and heard about tracking problems when using these unless I also use either purchase both upper and lower control arms or just upper control arms that are configured to correct this problem. I dont intend to race this vehicle on a slalom course just want it for riding around town and short trips Thanks for any advice