Transmission not shifting properly

Tiny
RANDY PITTS
  • MEMBER
  • 2005 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 154,000 MILES
I had a cooler line leaking so I got it fixed and about a week later when I come to complete stop I would take a minute to catch up, but then it would change out just fine.I change out the filter and fluid and then it got worse I would have to start out in one and change the gears manually and now when I put it in drive and press gas pedal not happen it pulls itself but nothing when press gas pedal. Please help.
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Sunday, April 11th, 2021 AT 4:46 PM

11 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

When you place it in drive, do you feel it shift into gear? Also, if I understand correctly, when you try to accelerate when in drive, the engine revs and the vehicle doesn't move. Tell me, how dirty was the fluid when you removed changed it and the filter? Also, when you installed the new transmission filter, did you remove the old o-ring in the valve body and install a new one on the new filter?

If you look at pic 1 below, I indicated the seal I'm referring to. It is very easy to forget the old one is there.

Let me know.

Joe
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Monday, April 12th, 2021 AT 8:35 PM
Tiny
RANDY PITTS
  • MEMBER
I don't feel it shift into gear when I put it in drive and yes the engine revs up but the car only pulls itself and vibrate and yes a new o-ring came with the filter. Do I need to send you picture of the old fluid?
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Thursday, April 15th, 2021 AT 8:22 PM
Tiny
RANDY PITTS
  • MEMBER
It also smells burnt.
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Thursday, April 15th, 2021 AT 8:25 PM
Tiny
RANDY PITTS
  • MEMBER
Could it be the pressure control solenoid?
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Friday, April 16th, 2021 AT 5:29 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Is that as black as it looks in the pic? Also, did this happen all at once? Usually, clutches will start to slip before the vehicle won't move. If that isn't what happened and it did happen all at once, it does sound like a pressure issue.

I reread your original post. If the fluid was that black and you were having issues as described, the new fluid could have finished off the clutch friction plates. Once they get extremely dirty and wear, the new fluid actually will clean the dirt off the clutch plates and cause them to slip. However, before I would say that is the issue, make sure the linkage is properly connected. If it is and the gear indicator is accurate, I would check line pressure.

Have a helper shift through the gears while you watch the shift cable on the trans. See attached pics (1 and 2). There is a clip that could have broken that holds the cable in place. If it broke or fell off, the cable won't shift the trans properly, so check that too.

The remaining pics explain how to test line pressure. You will need a gauge and scanner to perform the test. The last pic includes the line pressure specifications.

I hope this helps.

Take care,

Joe

See pics below.
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Friday, April 16th, 2021 AT 8:10 PM
Tiny
RANDY PITTS
  • MEMBER
It kind of did happen all if a sudden because it started doing this about a week after I got the cooler line fixed and yes the fluid is actually that black.
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Saturday, April 17th, 2021 AT 3:33 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi Randy,

I have a feeling the clutches are done. However, it wouldn't be a bad idea to do the line pressure test. At least we can eliminate that as a possibility.

As dark as the fluid is leads me to believe there are internal issues.

I wish I had a better answer for you. However, that is what I am thinking at this point.

Let me know if you decide to check line pressure or if you have other questions.

I don't know your plans, but in the event the trans needs replaced, I attached the directions below. The directions and pics are specific to your vehicle.

Take care,

Joe
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Saturday, April 17th, 2021 AT 7:40 PM
Tiny
RANDY PITTS
  • MEMBER
Someone said something about the torque converter itself.
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Saturday, April 17th, 2021 AT 10:27 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Yes, the torque converter can cause problems as well. However, I would think you would either hear a strange noise or it would work a little.

Joe
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Saturday, April 17th, 2021 AT 10:42 PM
Tiny
RANDY PITTS
  • MEMBER
There was a grinding noise when it would change out.
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Sunday, April 18th, 2021 AT 3:29 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Normally, a torque converter will make more of a thumping noise and not a grinding. A grinding sound makes me think something with the front pump or a damaged clutch pack.

There are thrust washers throughout the trans. Being the fluid was so dirty, it would likely have damaged them and any bearings.

I would check line pressure, if it is good, then there has to be an internal issue in the transmission which will require either a rebuild or replacement.

I wish I had a better answer, but these are my thoughts at this point.

Take care,

Joe
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Sunday, April 18th, 2021 AT 6:06 PM

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