Now that you mention calibration, I've noticed a marked changed in the handling/power delivery characteristics of my 2015 when in 4th gear at mid ~3500RPM and up. I've noticed it specifically when driving around the hill country canyon carving, where the understeer becomes noticeably less in 4th. If I move to 3rd gear, same speed the understeer increases (while RPMS and thus power available for transfer increase which is why I think it's a system logic). I think there is some specific programming in the TCM regarding the rear axle and 4th gear. Honestly I wish it was the same for 3rd gear because to put down power in 4th you have to be up in the rpms and therefore up in MPH... which is obviously unsuitable for cornering at speeds around 50-70.
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