What causes transmission to occasionally shift hard when accelerating

1999 PONTIAC FIREBIRD
12,700 MILES
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STEVEJ34
  • MEMBER
  • 1 POST
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.
Oct 29, 2011 at 9:50 PM
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SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
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.
Oct 29, 2011 at 10:48 PM
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