2006 gmc yukon xl 5.3L trailer mode shifting

[Woodblocker55]

Ok when you have a trailer on the Yukon xl in trailer mode your taking off you kick it down what RPM will it shift at ???? 5000 rpms sound right ? I have 4:10s.

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[Woodblocker55]

What's other yukon xl's shift at ? In towing mode ??? That have HD package ? I was like is it going to shift or blowup . Right at 5000 rpm.it shifted ya rocket action remember I just got the firmware updated to latest .Before it shift at 4000 rpm so there is different shifting in newest software. It will knock lose some 200,000 mile carbon .[emoji15][emoji849]

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