Compression Ignition Addict
Join Date: Nov 2006
Location: The Coastal Bend of Texas
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The tow/haul mode changes te tranny's shift points and also kicks in massive engine braking. It will run higher rpms before shifting. The engine braking is awesome when slowing down a trailer.
The gain/output should be adjusted like this: Set the gain low, like 2 or 3. Hook up the trailer and drag it around until you get the brakes warm. Then, when you are going about 30 or so slide the brake lever as far as it will go and see what the trailer does. If the trailer wheels don't slide then up the gain a bit and repeat. Keep doing it until you get trailer brake lockup and then back down on the gain slightly unitl the trailer brakes don't lock anymore. That's set for maximum trailer braking.
As far as towing 2500 pounds, you probably don't have to use tow/haul, but the engine braking is so cool that I use it when I am towing anything.
15 F350 Long Bed, Crew Cab, Lariat 4x4, 6.7 PSD