Transmission not shifting properly

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

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.

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

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

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