1999 cavalier auto transmission problem

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My 1999 cavalier, 2.2L auto, will not shift past 2nd gear.
When I disconnect the wire to the torque converter lockup, the trans shifts normally.
I've been told there might be a problem with the modulator valve.

I'm a retired mechanic but have little auto trans experience. I'd like to fix this myself but need guidance and possibly a drawing/diagram.

Any help is very much appreciated.

posted by  cavalier1999

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