Let me clarify something. I am not talking about extremely steep grades. I am talking about rolling hills typically found on trails that are classified as “easy”. Based on the responses you may think I am talking about climbing extreme grades. I would agree with you in that scenario. Same with my truck. If I am going up a very steep hill I too will put it in low.
What I am talking about is traveling on a level tail. 4 Wheeler is cruising in a high gear 4th or 5th. The trail now starts up a slight very safe up hill grade. My 420 AT will stay in 4th or 5th and not downshift to 4th or 3rd for example. It will bog down, clutch start slipping, and only with aggressive throttle will it downshift to a lower gear. I believe it unsafe is that the AT hesitates to long and when it finally does downshift it does so with a strong jolt.
Would you suggest for example the above scenario cruising down a trail in 4th or 5th auto mode now a slight grade comes up. You have to come to a full stop. Put the 4 wheeler in manual, climb the hill, stop, put the 4 wheeler in auto and continue down the trail.
If I came to an extreme grade I would always stop access the situation before I sarted up anyway. I am not talking about extreme grades
I guess I am trying to make sure with this brand new 4 wheeler it is working correctly. However If I thought it would never downshift automatically without coming to a complete stop I would have purchased a different machine. This would be the first AT 4 wheeler I know of that is incapable of downshifting. I have a Rubicon with AT and ride all day long in auto mode.