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go ahead and wind it up more in third, you need to to hit 2400 in third (with 3:73's) to be at least 1500 in 4th. These trucks do a lot better with the 6-speed. The 5-speed is a solid transmission, but it leaves gaps between 3rd/4th and 4th/5th. You can shift early if you are not in a hurry, but for the fun starts you need to let it rev to at least 2500 before shifting. Keep in mind that if you are running 4:10's, look at your rpm at freeway speeds that you could run all day if youwant.... more than 2k, for sure.
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