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I think you need to go up in gear ratio. From a 5.67 to a 5.43 is higher in ratio (less rpm more mph) here is a good way to see gear ratio and rpm, lets say you are running 7200 rpm and you think you want to run about 6900 rpm and you are running a 5.67 final drive, divide 7200 by 5.67 that will give you 1269.8412 now times that by 5.43 that gives you the rpm's you will be turning with the 5.43 6895.2377, just an example. You can do the same thing in reverse if you want to run more rpm's just start with what you have and quest at the ratio you think you should use it's all trial and erra.