When to change trans fluid?

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Dirt Bag

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I would only follow the Owners Manual if you drive "normally".
If you off road your truck regularly or tow regularly I would move that interval up.
I pulled my compact tractor and trailer up some pretty nasty mountains and through some tough 4x4 trails resulting in the tranny running hotter (not over heated) for an extended period of time so I changed it at 25k. I tend to go by types of miles rather than miles:)
 

HAYNES OFFROAD

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I did my motor and diffs at 1k miles, transmission at 10k miless. I do drive it hard, so I'll be doing them all again at 20k. All fluids swapped to Amsoil.
 
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