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<p>[QUOTE=&quot;GoldDot40, post: 10892534, member: 220749&quot;]I&#039;m in a 2021 Pete 389 w/ IX15 500/1850, 18sp, and 3.73 axle. This truck falls flat on it&#039;s face at 1700 RPM. Peterbilt nor Cummins will even consider raising the governor to just 2000 RPM. Because of that, I have to downshift a lot in the GA mountains even when it&#039;s pulling like a champ...then hits the 1700 ceiling and is unresponsive until it falls back to around 1400 while losing precious momentum.</p><p><br /></p><p>Our 2007 Pete 379 with 18sp and 3.55 axles just got a brand new crate ISX15 and the ECU is modified to allow it to spin up to 2150 RPM and the difference is night and day. It will absolutely run circles around this new truck.[/QUOTE]</p><p><br /></p>

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