LX is regular cab and SR5 is extra cab that year. Also LX did not come in 6 cylinder and di not have power windows or locks standard-just an option while sr5 is basically a power package. So sr5 is extra cab and could be V6 and has power package standard while LX is regular car 4 cylinder without power standard. There should with miles and cond. same a 3-5000.00 differance at least depending on options.