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Best money I ever spent on my truck has been replacing the rto14x15 with rtlo18918b. 15 speed is too big of a jump between direct and od. 3.70 on tall 24.5 around 96 at 2250 with .78 15. With 3406c either 60mph or 70+ and not much between if there was any wind. The old 15 was nearly bulletproof though. Spent about 400 bucks + oil changes in 1.5 mil miles.
 
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