I have a gmc sierra 07 model, 4 whl drive with a 6 in lift. I put it in drive and push the gas and it goes fine but will not shift from 2 to 3 at all. Sometimes i put it in gear and it jerks hard and

Asked by Jan 27, 2017 at 12:11 PM about the 2007 GMC Sierra 1500 SLE1 4WD

Question type: Maintenance & Repair

My truck don't wanna shift from 2nd to
3rd, and sometimes won't go in 1st.
Also at times when going from park to
drive or to rev it jerks real hard and dies.
U can hear the trans when u change
from 2h to 4h or 4low. It makes a loud
whinening noise. What should I look at
first.

1 Answer

79,335

First check the ATF level and make sure the fluid is not brown and burnt. You could change the transmission fluid and filter but I suspect you are due for a transmission rebuild.

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