Hi I'm new to this forum, I have a question, I will be going downhill around 55 mph and the rpm will be around 2000, and when I step on the brakes I notice the rpm jumps to 3000 causing an abnormal slowing, and it will slowly come back down to 2000 again when the speed reach 45 or less, It does not do this when I'm around 65 to 70mph. Other than this I love this truck it's got almost 200,000.