If you don’t mind, in the driver door jam, there should be a sticker listing the final drive ratio and the transmission model. Mind taking a pic and posting it?
Need advice on gear ratio
Discussion in 'Experienced Truckers' Advice' started by MikeinTennessee, Mar 28, 2020.
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Tall 22s will give you 7 miles an hour it’s better just to swap the transmission for an RTO overdrive!
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FRO 15210B. I’m seeing that this is a direct drive transmission, not an OD transmission. Even if you run taller rubber, it’s not going to make enough difference in rpm. @larry2903 called it.
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What kind of transmission? If it is a 10 speed you may be able to make it an overdrive by turning around the counter shaft in the transmission. Then 10 and 9th would be reversed, 9th where 10th is and 10th where 9th is in the shift pattern. You may also be able to add the overdrive to the 10 speed, but I think that only works with a 9 speed to make it a 13 speed. Overdrive will cost money in fuel milage but it will give you more speed.
The best plan would be to wait until the rear diffs are worn out, then get a 3.08 or 2.74. Then 9th would be your cruising gear and 10th would be for running from the law only. -
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