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Low pressure to the 4th gear servo will cause this. Usually its because of a small piece of crud restricting fluid flow and replacing the fluid and filter takes care of it. Happens a lot after 50K miles between fluid changes.
Yup...whenever any small contaminates enter the line pressure path they always seem to go right to the small orifices in the reverse servo. We solved many cases like yours with a simple flush...
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Hi, sorry for the delay.
A flush removes much more fluid than just pulling the pan and draining whats in the pan, so it does a better job in that area. However it does NOT replace the filter when doing a power flush and it is important to do that.
I would recommend you to drop the pan and replace the filter and just fill it up with new fluid to start with and if it still has problems then have the system power flushed in cas there is something blocking fulid flow like we discussed earlier.
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