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Discussion Starter #1 (Edited)
At speeds of 40-60mph AutoTransmission gears slip. Drained 4qts of transmission fluid and added fresh 4qts. Ran fine for a week or so and slip is back at 50-60 mph.
Should I change the Transmission filter? 240,000 miles on transmission. Fluid doesn't have an odor and looks ok (not fresh) after replacing 4qts.
 

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Is this the first time you did anything to the transmission ?
There's several things that can cause this symptom.
 

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With that many miles on it I would recommend a rebuild.
Before you rebuild the transmission try changing the filter (if it has one) and all the fluid.
You might substitute one qt of fluid with a qt of repair fluid like TransX.
A rebuild will cost thousands of $$.
A flush and filter $100 At most.
 

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yes, you give the better suggestion I have experience regarding this I did not knowledge to maintenance car I return to the shopping and hear a noise that comes from the transmission side I stopped my car use Roadside Assistance Services to reach the garage that tells me changing the filter.
 
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