I swapped out 05 GMC Sierra tranny , put in tranny from 0...


I swapped out 05 GMC Sierra tranny , put in tranny from 07 , used n/s switch from old tranny, car hesitates to shift , drive ,3 gears want catch can only drive in 2? Mechanic's Assistant: How old is the transmission? Have ...

I swapped out 05 GMC Sierra tranny , put in tranny from 07 , used n/s switch from old tranny, car hesitates to shift , drive ,3 gears want catch can only drive in 2? Mechanic's Assistant: How old is the transmission? Have you noticed any leaking? Its out of 07 GMC Sierra, no leaks! Mechanic's Assistant: What is the model of your '07 GMC? GMC Sierra 1500 5.3 L Mechanic's Assistant: Are you fixing your Sierra 1500 yourself? What have you tried so far? No! A friend


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Automotive Expert
Hello, I'll be happy to help you out with this, and sorry you're having this trouble. First of all, just so I'm 100%, is it 4WD and is it the 4 speed?

No, it isn'tIt's 2wd and it's automatic!
Automotive Expert
Ok, but it's the 4 speed automatic not the six speed correct?
Automotive Expert
Hey just checking back in on this, do you know if it's the 4 speed or the 6 speed automatic? The neutral safety switch on the 4 speed would be the same as the old one so it should work. I would scan for codes first, as it sounds like it may be in limp mode. Limp mode only allows the truck to drive in 2nd gear.

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