Overdrive problem

Tiny
GPGTJIM
  • MEMBER
  • 2000 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
  • 140,000 MILES
Car shifts fine first to second, second to third always. When shifting from third to overdrive it often slips, the tachometer shows the rpm indicator is waving around. If I punch the gas peddle it sometimes makes it shift. Going uphill it downshifts okay, but then wont return into overdrive till about 5000 rpm's. I recently had the transmission fluid and filter changed as the fluid was clear, now it is pink again and transmission behaves slightly better. They found almost no metal filings in the pan. Also tried some GM transmission additive little improvement. Is this indicating the over drive shaft splines are worn or is it worth trying to change out the pressure and shift solenoids?
Friday, September 2nd, 2016 AT 12:03 PM

6 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Why was the fluid clear? When transmission fluid gets more miles on it it will eventually turn black. I have never seen the fluid turn clear. Was it milky?
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Friday, September 2nd, 2016 AT 1:19 PM
Tiny
GPGTJIM
  • MEMBER
  • 5 POSTS
No it almost looked like new motor oil. The service centre had no explanation except they had to flush the system twice to get it done right and they wondered that it still shifted at all.
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Friday, September 2nd, 2016 AT 9:53 PM
Tiny
GPGTJIM
  • MEMBER
  • 5 POSTS
Oh, I forgot to say that the transmission has always made a whining noise in lower gears. I have put about 9000 miles on it since I purchased it last summer.
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Friday, September 2nd, 2016 AT 9:57 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,770 POSTS
It sound like the transmission is worn out and needs rebuilding. The whine comes from the trans filter being plugged with clutch material.

Please let us know what happens so it will help others.

Best, Ken
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Monday, September 5th, 2016 AT 9:55 AM
Tiny
GPGTJIM
  • MEMBER
  • 5 POSTS
Ken, I have recently had the transmission flushed and the filter changed this did not make any difference to the whine.
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Tuesday, September 6th, 2016 AT 9:19 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,770 POSTS
The only other thing I have seen that would make the transmission whine is the front pump is going out which means a rebuild is in order.
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Wednesday, September 14th, 2016 AT 4:59 PM

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