Yes, it's the kickdown cable. When you adjust it longer (and that what you need) it will drop shift sooner and when you adjust it shorter it will up/down shift after a longer time and speed. Be aware that playing with not knowing what you are doing may miss align the shifting time. Just once you finished aligning it and you are happy with the shifting drive in a speed of 100KM/H the without acceleration manually move the transmission handle to the 3rd gear, here it must respond and downshift by force to the 3rd gear. If it didn't respond then you need to realigne it.

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