want shift out of first gear

1997 CHEVROLET LUMINA
196,000 MILES • 3.1L • V6 • FWD • AUTOMATIC
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JOE1953
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  • 776 POSTS
when taking of in the car the transmission want shift out of first gear the fluid and filter been change what could be the cause and how do I check the modulator valve?
Nov 7, 2014 at 10:53 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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