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Transmission not shifting into overdrive at normal speed

Tiny
DGOSS6
  • MEMBER
  • 1986 CHEVROLET CORVETTE
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
  • 65,000 MILES
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.
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Tuesday, May 20th, 2014 AT 2:08 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have a trans guy look at it sounds like you have lost the lock up clutch in converter and probably o/d
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Tuesday, May 20th, 2014 AT 3:15 PM
Tiny
DGOSS6
  • MEMBER
  • 2 POSTS
Thanks Hmac300 for the quick reply. That's what I'll probably do.
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Tuesday, May 20th, 2014 AT 6:33 PM

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