Transmission Shifting Hard

Asked by BinGharib Oct 25, 2020 at 06:23 AM about the 2006 GMC Sierra 2500HD Crew Cab 4WD

Question type: Maintenance & Repair

(First Owner) I have GMC Sierra 2006 2500hd 6.0L
4 speed automatic transmission with mileage
290000km. When I start the engine everything work
fine until I cross 120 km/h the problem start here,
the transmission start shifting hard from gear 1 to 4.
And this problem disappears when I restart the car.
When I drive slow this issue not happening!

1 Answer

Omar5733 answered 4 years ago

I have same situation and I'm from dxb dubai but my chevy truck have 6.2l l94 with cam stage2 and intake mainfold ls3 but i dont know what is the problem even the tuner

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