What causes transmission to occasionally shift hard when accelerating

Tiny
STEVEJ34
  • MEMBER
  • 1999 PONTIAC FIREBIRD
  • 12,700 MILES
If accelerate to fast when car shifts from first to second it will shift hard and will continue to shift hard until car is parked. Also I've been told if transmission fluid has not been changed in awhile chaging oil could cause damage.
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Sunday, October 30th, 2011 AT 4:50 AM

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Tiny
SATURNTECH9
  • EXPERT
Are there any codes?Have you checked for codes?Most of the time a hard shift is caused by too high of pressure inside the transmission.I have also seen bad connection to the inlet air temperture sensor cause a hard shift. How long has it been since you changed the transmission fluid?Also throttle position sensor issues I have seen cause a hard shift.
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Sunday, October 30th, 2011 AT 5:48 AM

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