transmission clunk 1989 300e

Hello, My 1989 300e AT clunks when upshifting and downshifting. It sounds like the "clunk" is coming from the rear end. However if I accelerate to high
rpms it shifts fine. Any Ideas on whats wrong?
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wrote:

check fluid level while idling.
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Just serviced the tranny, Fluid levels seem to be fine. Thanks
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