I calls BS, what's the miles on your A/T Z & what year,, mines a 2011 & never an issue with it in drive- always shifts @7500 by itself without going in limp mode( as spoke by someone else manual shifting) I've done that before too. From 60 with factory gearing: it should downshift to 3rd and wind up to around 85 & **** to 4th.... Have you ckd your tires or had them replaced lately::: different diameter tires will make it act stupid. Also- when was last time you serviced Trans or ckd fluid level.
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