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Transmission swap


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is there a 13speed transmission that can be swapped out in 91 superliner.it has a 14613b eaton fuller w/425 cat and 4.42 rears.truck pulls good, but tops out around 60 or so mph.looking maybe for a little more legs.i know you can swap tires but just wondering if there is a trans to get more speed

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I'm pretty sure rto eaton are single overdrive. Where the rtlo are double.

I can't talk for every eaton, but I looked at a single overdrive rto 13 and the overdrive was .86 and the rtlo is .87 in 13/17th and .73 in top.

With .73 od and 4.42 you should have 1700rpm at 100km/60m.

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