Are you sure its stuck in first gear, Its probably in second.. It sounds like a stuck or open shift solenoid in the tranny (4L60E hydra-matic). Depending on the year and type of tranny this was a default setting to either only second or only third gear, should some electrical or transmission hydraulic fault occur. Another common problem for that year is a faulty ignition switch at the key cylinder. It will fail and not send power to the tranny (thus not powering up the shift solenoids). The default (or limp home mode) is when both solenoids are commanded off. They will be both commanded off in second gear (even when the tranny is operating normally).
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i can put it into drive... but it wont shift out of first gear,.. i have to do it manually
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