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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
When using overdrive the transmission will take advantage of overdrive, if you turn o/d off it can and will sometimes shift at higher rpms.
In some cases it is perfectly safe to tow with overdrive on, you can evaluate your driving and transmission to determine which is better for you. I highly suggest for heavy towing a larger trans cooler, filter system and trans temp gauge to be sure you do not cook the tranny as heat is a major killer of them. Another thing that does help is a programmer such as tow only mode but you also want to run a pyrometer.
Thank you!- Joe
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