automatic trans problem

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CLARK W GRIZWALD
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I have a 1988 Chevy Celebrity with a 2.8lL engine with 96,000 miles and an automatic trans with overdrive.

It up-shifts fine, but when slowing down it hits hard into first gear at around ten miles per hr.
And when I shift into reverse it also hits hard into reverse. What could be the cause?

The fluid level is correct but never has been changed.
Feb 14, 2007 at 7:16 PM
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https://images.2carpros.com/forum/automotive_pictures/30961_images_2.jpg

I would start off with a transmission filter and fluid. IT should been done 3 times by now.
Feb 14, 2007 at 8:24 PM
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