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The truck has a tow/haul mode, I'm not sure why you would need to lock out a gear.
Well just this morning wife took a trip with me to the tractor dealer in Paige. Lots of up and downs from Shiner on up via hwy95 to hwy 290 to Paige.
Using the tow/haul mode it kept shifting to 6th during hill descents. I was talking to myself (Sh don't tell wife , OK?lol), and was wondering the same thing.
So now when I go pick up tractor will use the minus function. Will monitor the performance on the return trip.