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Auto transmission shifts into overdrive when it.

Tiny
KEV3345
  • MEMBER
  • 1992 DODGE RAMCHARGER
  • 80,000 MILES
Auto transmission shifts into overdrive when it doesn't have too. What could be possible cause? Trans was recently rebuilt.
Tuesday, December 11th, 2012 AT 1:43 AM

4 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,741 POSTS
What do you mean by "doesn't have to"? Do you mean it's going into overdrive at too low a speed?
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Tuesday, December 11th, 2012 AT 1:56 AM
Tiny
KEV3345
  • MEMBER
  • 4 POSTS
You can be cruising at 45mph and it will just shift into overdrive. No hills, no passing anyone, it just shifts.
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Tuesday, December 11th, 2012 AT 2:14 AM
Tiny
KEV3345
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  • 4 POSTS
Doesn't do it all the time either.
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Tuesday, December 11th, 2012 AT 2:25 AM
Tiny
CARADIODOC
  • MECHANIC
  • 33,741 POSTS
It should be in overdrive before 45 mph if you're cruising at a steady speed. If all the other shift points are correct, the governor valve is working properly and the kick down cable or linkage is adjusted correctly. If it shifts into overdrive too soon when you're still accelerating, that is an issue with the kick down adjustment. Once they switched from using a linkage to a cable, sticking cables became common and would cause delayed up-shifts, and down-shifts that happened too soon before the vehicle speed got low enough.
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Tuesday, December 11th, 2012 AT 2:33 AM

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