Mystery is solved! Its 3.42. Which is good news to me. Was told 3.25 when I bought the truck lol
Find gear ratio on pete 389
Discussion in 'Peterbilt Forum' started by Wespipes, Aug 30, 2020.
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If the ecm was set for a different diff ratio it just makes the speedo inaccurate.spsauerland, singlescrewshaker and Wespipes Thank this. -
Good luck with the truck. Any photos?
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If you walk into the dealership, they can print off a build sheet for the truck. Every time I've gotten into a truck, I've made that request and always had them handed right over.
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