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Manual Shifting a Automatic Problem?
Monztruz posted a topic in 2000-2014 Silverado & Sierra HDSo I’ve searched all over and can’t seem to get a straight answer to what I’m experiencing. So I have a Black Bear Tuned 03 GMC Sierra 1500HD with the 4L80E 4 Speed Automatic transmission with the ability to Manually shift 1-2-3. My understanding is that when I Manually shift it down into 1st gear it’s suppose to lock it into 1st gear so it revs up way higher and engine brakes to slow down but does not shift until I manually shift up to 2 or 3 or put it back in Drive. Well when I lock it into 1st gear, the revs are much higher but it still automatically shifts to 2nd gear once I get close to 25-30mph even though I have 1st gear selected. Is Manual shift lock not working for me? Has anyone else experienced this? I just don’t get the point of manual shifting if it’s still gonna shift up automatically anyway Thanks for any input!