I bought a 2003 Yukon with a 4.8 engine and a 4L60E transmission. I live in the Adirondack mountains in upstate New York and I have a problem that I have never heard of. Got the cruise on 60 and I'm heading up the side of a mountain on a road and my truck will downshift from overdrive to third and then down to second in a matter of 5 seconds. I've never heard of this in my life, would anybody have any ideas?
2003 Yukon downshifting problems
- Thread starter KenG
- Start date
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Scottydoggs
Full Access Member
try the same rt with out cruise control.
CC will keep giving it gas till its picking up speed, a large hill can slow you down and then its going to floor it if its not gaining speed back fast enough.
CC will keep giving it gas till its picking up speed, a large hill can slow you down and then its going to floor it if its not gaining speed back fast enough.
rockola1971
Full Access Member
Its not a problem. Its the cruise causing it. Your cruise is set for XX MPH and you are going up a steep hill/mountain in a big heavy SUV. The computer sees the speed drop alot and was programmed by you to maintain XX MPH so it gives more throttle which causes a quick downshift and since that didnt solve the speed issue it caused another downshift and I bet the RPM's jumped up alot too. Turn the cruise off going up steep inclines and your "problem" will go away.
^^^ This. Mine acts the same way if I let it.
rockola1971
Full Access Member
Mine too. Even if its just a decent hill while hauling a heavy load. Every Car Truck or SUV will do this. Putting it in Tow/Haul might relieve some of it.
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