Why would you want to turn it off?
FYI your chassis is an
F-53.
Usually "hill descent" is simply: when going downhill tap the brake and it will downshift a gear to provide some engine braking. On older models it would only do that when tow/haul is engaged but I think newer models do that all the time. (Tow/haul is turned on/off with the switch on the end of the transmission shift arm.)
There really isn't any other bells & whistles with these basic Ford chassis (ABS is about the only other thing we get) so don't bother looking for any extra controls anywhere.
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