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Old 05-13-2013, 07:58 PM   #1 (permalink)
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Change transmission fluid?

Just curious to know what the consensus is on changing the transmission fluid.
My 01 Impala has 67k miles on it but I know it overheated a few times with the previous owner. I don't know if the fluid was ever changed but since the ATF is cooled by the radiator, engine overheating means this fluid was also overheating.
I've read horror stories about people changing their fluids only to find new problems. I also heard of people not changing their fluid and paying the price because of it.

Any thoughts?

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Old 05-13-2013, 09:21 PM   #2 (permalink)
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Most people who have problems after a fluid change was either due to lack of previous maintenance (not changing when needed/recommended) or they flushed the system, which is a transmission killer. Drop the pan, change the filter and pan gasket, and top off the fluid with recommended fluid.

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Old 05-13-2013, 09:29 PM   #3 (permalink)
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Normal trans temps should be around the 180-200* area, just because the motor over heated does not necessarily mean the trans also did. You shouldnt have any problems changing out the fluid, especially only at 67K.

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Old 05-13-2013, 09:34 PM   #4 (permalink)
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Quote:
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Normal trans temps should be around the 180-200* area, just because the motor over heated does not necessarily mean the trans also did. You shouldnt have any problems changing out the fluid, especially only at 67K.
Did you get your fixed Dave?

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Old 05-13-2013, 09:57 PM   #5 (permalink)
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Quote:
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Normal trans temps should be around the 180-200* area, just because the motor over heated does not necessarily mean the trans also did. You shouldnt have any problems changing out the fluid, especially only at 67K.
True, but the car exceeded 240 degrees. I've had overheating issues on my other impala (head gasket related) and I decided to change the atf after that. Instead of being red it was brown in color.

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Old 05-13-2013, 10:02 PM   #6 (permalink)
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Did you get your fixed Dave?
No, trans is out and I have to swap the harness to the new one. Should be going in and be done tomorrow hopefully.

Chip, I seriously wouldnt worry about it, It would take a long time for the trans to over heat, even when the engine is.

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Old 05-13-2013, 11:28 PM   #7 (permalink)
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Quote:
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Chip, I seriously wouldnt worry about it, It would take a long time for the trans to over heat, even when the engine is.
Exactly, I would change the fluid though, just for routine maintenance...


And good luck with the swap dave. Start a thread and provide pics

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Old 05-14-2013, 09:09 AM   #8 (permalink)
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67k and you don't know the history, just go ahead and change it, it won't hurt.

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Old 05-14-2013, 07:04 PM   #9 (permalink)
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And the filter too while you're at it.
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Old 05-16-2013, 01:28 AM   #10 (permalink)
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And the filter too while you're at it.
Should always be done when replacing fluid

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Old 05-19-2013, 06:48 PM   #11 (permalink)
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Should always be done when replacing fluid
Not if you take it to a shop for the flush. The flush cleans the filter.

To OP. At 67k miles you will be fine. Our transmission guy has been working there for 18 years and specializes transmissions by choice. He even told me my car is on the borderline for flushing. He also informed me that GM highly recommends using dexron VI instead of III. Especially in the 4t65e and hd's.

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Old 05-19-2013, 06:50 PM   #12 (permalink)
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Flush = transmission failure, I NEVER would...

Not changing the filter is a lazy way out of a job, period...

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Old 05-19-2013, 07:29 PM   #13 (permalink)
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K cool. Just stating what GM certified service(used to be goodwrench) states.

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Old 05-19-2013, 10:16 PM   #14 (permalink)
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K cool. Just stating what GM certified service(used to be goodwrench) states.
For the most part they are blowing smoke up your (you know what). A fush w/o a filter change after just removes and sloshes around the small metal shavings that were trapped in your filter. Totally defeating the purpose if a filter Therefor, unless it is flushed then fluid and filter changed it is NOT recommended

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Old 05-20-2013, 05:32 AM   #15 (permalink)
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I have made it a habit to change trans fluid, diff and coolant every 3 years regardless of the mileage. Maybe thats a bit excessive but when you consider the costs it is really cheap compared to the cost of replacing major components.

As far as flush vs change goes....since I do mine periodically the fluid left in the system in a change is minimal so it stays pretty clean. I did have my old Durango flushed before and I really can't say anything bad about it. Again since I service it frequently the filter was changed the next time around so flushing was fine every other time and is so much faster to have done.

When I change my trans fluid the first time I always install a drain plug so the next time around its not nearly such a messy job.
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