You can not disable the automatic downshift if it is a harsh shift you have a defective transmission or other shift control issue. I would go with the transmission being defective. Has the fluid and filter ever been changed? should be done at about 60,000 miles for optimum transmission life and function.
I actually only have 33000 mi on it. Dealership says when I am going down a mountain and around here that would be at a 6% grade it down shifts as though I have manually pulled my gear shift to a lower gear. Told me it is supposed to save brakes. If I hit the gas it shifts back up until I brake again. Was told I could push button on end of gear shift when starting engine and hold and it disengages that system. My 2004 Avalanche did not have his feature. Afraid if I disengage the system it will hurt brakes/transmission.
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Do you have the cruise control on when this unwanted down sfift occurs? I don't understand why this would annoy or scare you. Are you that inflexible? Both my cars have this feature, I love it.
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