Cable too slack.
Because that's all it can shift. It starts in first. The first shift puts the car in second, and the second shift puts it in third.
That is True.. A faulty speed sensor will cause no shift or late shift..
A bad first speed overrun clutch.
your clutch packs are cooked
The tranny uses a preset program to shift that is computer based. You use your right foot on the gas pedal to get the trooper up to speed for the shift to happen in the normal driving scenario.
Worn synchonizer?
The tranmission is usally the of the cause of a car not shfting right.
Damaged/broken shift forks
The LS has a five speed transmission. Therefore it shifts from first to second, second to third, third to fourth and fourth to fifth. Four shifts.
There are two speed sensors for this car. One is located in the transmission an the transmission needs removed to replace it. An the other sensor is located right above the passenger side trans axle "CV Shaft". This one tells the car when to shift an also tell the car's speedometer what to read. if this one is bad it will cause the car to shift hard an sometimes not at all. it will act like its stuck in first gear an not want to shift into second or over drive.
Sounds like it may be a vacuum leak Check fittings and vacuum hoses under hood, under dash and at vacuum modulator on transmission
It was the speed sensor. and it could also be the DRAC. Which is a speed sensor buffer that is located behind the dash to the left of the glove box. It is a white box.