transmission not shifting into overdrive at normal speed

1986 CHEVROLET CORVETTE
65,000 MILES • 5.7L • V8 • RWD • AUTOMATIC
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DGOSS6
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On steady acceleration, trans. usually shifts into overdrive at 45-48 mph. Normal rpm at 65 mph in o/d was about 1500. Currently, the rpms stay about 2000-2200. I can feel the trans. shifting 1-2 then 2-3, but not 3-4. Gas mileage has dropped from 28mpg on the highway to about 21 mpg.
May 20, 2014 at 2:08 PM
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HMAC300
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have a trans guy look at it sounds like you have lost the lock up clutch in converter and probably o/d
May 20, 2014 at 3:15 PM
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DGOSS6
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Thanks Hmac300 for the quick reply. That's what I'll probably do.
May 20, 2014 at 6:33 PM
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