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Discussion Starter · #1 ·
I just got a trans flush and a filter change and the trans began to shift funny, like it was holding onto a gear and not shifting. I took it back and they added a half quart of trans fluid. Still shifts funny until it warms up and then it seems better, but still a little bit off. Has any one had this experience?
 

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Hrmmm...I was thinking about getting this done but I'll watch this thread to see the outcome...please keep us posted...
 

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i've never seen a flush help or fix anything... they only tear up more stuff... and if you havent changed filters like every 15k miles i DEF wouldnt flush one... hell if its been more than 50k i wouldnt even change the filter all the clutch material is probbably floating in the fluid.
 

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search for Checking,Filling,Changing ATF on the other board, but here is the version minus illustrations:

This is the service procedure on a 2007 Corvette. Same procedure for ours.
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Testing and Inspection


Transmission Fluid Checking

This procedure checks both the transmission fluid level, as well as the condition of the fluid itself. Since the transmission on this vehicle is not equipped with a fill tube and dipstick, a tube in the bottom pan is used to set the fluid level.

Notice: The transmission fluid level must be checked when the transmission fluid temperature (TFT) is between 30-50°C (86-122°F). If the TFT is not within this range, operate the vehicle or allow the fluid to cool as required. Setting the fluid level with a TFT outside this range will result in either an under or over-filled transmission. TFT>50°C =under-filled, TFT<30°C =over-filled. An under-filled transmission will cause premature component wear or damage. An over-filled transmission will cause fluid to discharge out the vent tube, fluid foaming, or pump cavitation.

1. Observe the TFT using the driver information center (DIC) or a scan tool.
2. Start and idle the engine.
3. Depress the brake pedal and move the shift lever through each gear range. Pause for at least 3 seconds in each range. Move the shift lever back to PARK. Ensure the engine RPM is low (500-800 RPM).
4. Allow the engine to idle for at least 1 minute.
5. Raise the vehicle on a hoist. The vehicle must be level, with the engine running and the shift lever in the PARK range.
Notice: THE ENGINE MUST BE RUNNING when the trans oil level check plug is removed or excessive fluid loss will occur, resulting in an under-filled condition. An under-filled transmission will cause premature component wear or damage.

Important: Continue to monitor the TFT. If the TFT is not within the specified values, reinstall the trans oil level check plug and repeat the previous steps.

6. Remove the trans oil level check plug (1) from the transmission fluid pan. Allow any fluid (2) to drain.

If the fluid is flowing as a steady stream, wait until the fluid begins to drip.
If no fluid comes out, add fluid until fluid drips out.

7. Inspect the fluid color. The fluid should be red or dark brown.

If the fluid color is very dark or black and has a burnt odor, inspect the fluid and inside of the bottom pan for excessive metal particles or other debris. A small amount of "friction" material in the bottom pan is a "normal" condition. If large pieces and/or metal particles are noted in the fluid or bottom pan, flush the oil cooler and cooler lines and overhaul the transmission. If there are no signs of transmission internal damage noted, replace the fluid filter assembly, repair the oil cooler, and flush the cooler lines.

Fluid that is cloudy or milky or appears to be contaminated with water indicates engine coolant or water contamination. Refer to Engine Coolant/Water in Transmission. See: Testing and Inspection\Symptom Related Diagnostic Procedures\Engine Coolant/Water in Transmission
8. Replace the trans oil level check plug and tighten to 25 N.m (18 lb ft).
9. Inspect for external leaks.
10. Reset the oil life monitor only if the fluid was changed.
Transmission Fluid Fill Procedure

Notice: Use Dexron VI transmission fluid only. Failure to use the proper fluid may result in transmission internal damage.

Perform this procedure for vehicles with transmissions that are not equipped with a fill tube and dipstick. Based on accessibility, transmission fluid may be added through the fluid fill tube plug assembly (1) hole or through the oil level check plug (2) hole in the bottom of the transmission fluid pan.

Tools Required
DT 47784 Transmission Fluid Fill Pan Adapter
J 45096 Transmission Oil Cooling System Flush and Flow Test Tool
J 45096-30 Transmission Cooler Flush Adapters
J 45096-40 Transflow Oil Fill Adapter
Fill Tube Plug Method
Notice: Before removing the transmission fluid fill tube plug assembly, thoroughly clean around the plug to prevent dirt or contaminants from entering the transmission during plug removal. Use compressed air to dislodge any caked dirt that may be stuck on and around the plug area. Use a mirror to confirm the area is free of dirt before removing the plug. Failure to clean around the plug may result in transmission contamination.

1. Clean around the fluid fill tube plug.
Important: It may be necessary to use a long pair of 90 degree needle nose pliers to lift the plunger and remove the plug assembly.

2. Unlock the fill tube plug by lifting the plunger. Once the plunger is lifted, remove the entire plug assembly.
3. Determine the approximate amount of fluid needed to fill the transmission, based on the repair performed. Refer to Fluid Capacity Specifications. To avoid an under-fill condition, slightly overfill the transmission, and then allow the extra fluid to drain during the fluid checking procedure.
Important: The J 45096 is being utilized as a convenient method to pump the fluid into the bottom pan. A suitable hand pump may also be used instead. When using the J 45096, monitor the display panel to determine the amount of fluid being pumped from the tool supply tank into the transmission.

4. Using the J 45096-40 (1) and the J 45096 (2), or a suitable hand pump, add transmission fluid through the fill tube plug opening. Refer to Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096) for complete J 45096 operating instructions. Use the FLOW position on the main function switch to pump the fluid.
5. Check the fluid level.

Check Plug Method
Important: When the oil level check plug is removed with the engine OFF, transmission fluid may drain from the hole.

1. Remove the oil level check plug.
2. Install the DT 47784 (1) and, if necessary, one adapter from the J 45096-30 (2).
3. Determine the approximate amount of fluid needed to fill the transmission, based on the repair performed. Refer to Fluid Capacity Specifications. To avoid an under-fill condition, slightly overfill the transmission, and then allow the extra fluid to drain during the fluid checking procedure. Important: The J 45096 is being utilized as a convenient method to pump the fluid into the bottom pan. A suitable hand pump may also be used instead. When using the J 45096, monitor the display panel to determine the amount of fluid being pumped from the tool supply tank into the transmission.
4. Using the DT 47784 (1), J 45096-30 (2), and the J 45096 (3), add transmission fluid through the check plug hole. Refer to Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096) for complete J 45096 operating instructions. Use the FLOW position on the main function switch to pump the fluid. Important: Failure to start the engine and move the shift lever through the gear ranges before removing the DT 47784 and J 45096-30 from the bottom pan will result in an excess amount of fluid draining from the check plug hole. This may lead to an under-fill condition.
5. Start the engine and move the shift lever through each gear range. Pause for at least 3 seconds in each gear range.
6. With the engine still running, remove the DT 47784 (1), J 45096-30 (2), and J 45096 (3) and then check the fluid level.


Information supplied courtesy of Alldatapro.com
 

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Discussion Starter · #10 ·
danlewis: Thanks for that information, it is good reference material. I observed what the tech's were doing as they flushed the fluid and they definitely went through the gear progression procedure. The real problem cropped up when the filter was changed. Everything was fine until then. I went to get my trans flushed initially and the shop said that they would change the filter, too, but they didn't have a filter in stock for the 6l80, so they just did the flush and told me to come back in a few days when the filter arrived and they would change it. The trans shifted normally after the flush. I come back and get the filter changed a few days later and things started to go south.

I took the car back when I noticed the odd shifting and that's when they re-checked the fluid level and went through the gear check progression and added a half quart. Things seem a little better but I am going to monitor it for a few more days.

If things don't get better maybe I have nother flush only done.
 

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Trans flushes are one of the biggest rip off gimmicks in the auto maintenance/repair biz. I also have never seen a trans flush do anything but harm.

Doing a trans flush takes clutch material, sitting in nooks and crannies in the trans out of the way, and flushes it into places it don't belong. It doesn't clean squat out.
 

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danlewis: Thanks for that information, it is good reference material. I observed what the tech's were doing as they flushed the fluid and they definitely went through the gear progression procedure. The real problem cropped up when the filter was changed. Everything was fine until then. I went to get my trans flushed initially and the shop said that they would change the filter, too, but they didn't have a filter in stock for the 6l80, so they just did the flush and told me to come back in a few days when the filter arrived and they would change it. The trans shifted normally after the flush. I come back and get the filter changed a few days later and things started to go south.

I took the car back when I noticed the odd shifting and that's when they re-checked the fluid level and went through the gear check progression and added a half quart. Things seem a little better but I am going to monitor it for a few more days.

If things don't get better maybe I have nother flush only done.
Because of the location of the filter, doesn't that -require- losing some of the transmission fluid? Seems like to change the filter you have to re-fill.
 

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Discussion Starter · #13 ·
Because of the location of the filter, doesn't that -require- losing some of the transmission fluid? Seems like to change the filter you have to re-fill.
That's right as far as i know, and they did. Seemed weird that they would do it twice.
 

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Personally I would never get a transmission flush done. We have seen more issues arise from flushes than not....
 

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Did they check it properly? Engine running in park between 30-50*C you pull the plug out of the bottom of the pan until just a tiny stream comes out. If nothing comes out, it is too low. If fluid pours out, it is too full. If not checked in the right temp range, the fill will be inaccurate.
 

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What about just a drain and re-fill? Would that be better than going through a flush sequence?

Sent from AutoGuide.com Free App
 

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