besides changing the fluid, using synthetic fluids, the biggest thing for transmission life is to keep it cool.
Most people do not realize the most damage to truck transmissions is during backing up, when air is not forced through the radiator/transmission cooler. Transmission temperatures will soar !!!
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87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100
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