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GMC Yukon XL transmission problem
i have a problem with the transmission of my 05 yukon xl denali
when the car is 2nd gear it start to rev the engine and the vehical does not gain speed and then it shifts to 3rd .Even When Shifting to third it revs like its neutral and then it shifts.Can i know what is the problem?
THINGS CHECKED :
OIL IS IN RED COLOR NOT BROWN
NO PARTICALS IN IT
EVEN TRIED THE TRANSMISSION TUNING
An advise or suggestion would be helpful