I live here in Western Colorado, so any where I go I have to go over major mountain passes. Having driven trucks all my life in Colorado I had my allison pre-select changed from 2nd gear to 6th. This way I can control the gear selection on the e-brake with the RPM's of the engine. I agree with the posts brakeing solution of using hard brake to slow down and not use continuelly. If your not knowledgeable or have truck driving experience this may not be a good option for a newbi.