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Old 02-11-2020, 10:39 PM
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No Upshift Uphill

Hey there fellow Xoutposters, My 2001, X5, 4.4, mated to an automatic transmission has this one consistent quirk. If I were to drive up a very steep hill, the vehicle refuses to upshift from 3rd to Fourth gear. No matter the ambient or engine temperature. If I were to accelerate harder, bringing up the RPMs along with vehicle speed, still no upshift. I've driven this car for 3 years, this is the norm on the steep hills in my area. I automatically upshift manually without any thinking to do so. (Car has me trained.) Car shifts without any problems driving on flat or slight inclined roads. Transmission never slips. Your thoughts please.
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Old 02-11-2020, 10:59 PM
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When was the last time you changed the ATF or checked its level? How many miles on the odometer?
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Old 02-11-2020, 11:34 PM
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Depending how steep that might be the proper gear. Not healthy for an engine to be in too low of RPM with high torque demand. Will it upshift and stay when you do a quick lift off the throttle? Also in m/s how does the engine sound in 4th.

I have a couple apps that use a WiFi connection to obc and will report real-time horsepower & torque, it would be a helpful tool to get some readings
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Old 02-12-2020, 12:05 AM
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I can feel a difference in gear selection in my neighborhood hills (minor incline) and that is a very low load, just leaving my house. I can definitely feel the difference from level surface to incline, even with the ever so slight climb. Mine will stay in second and delay the shift to 3rd until I crest the incline.

Mine is a 3.0L with the GM AT: 5L40-E/GM5 (A5S 390R)
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