Overfilling it could sometimes be as bad as underfilling it. It's a good way to bust a seal, or pop the pan gasket. It will sometimes shift rough.
When you're putting fluid in it how are you checking the level? You know there's only 1/2 quart difference between the ADD and FULL marks, don't you?
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'69 3/4 ton C20 2wd-350ci/TH400
'69 3/4 ton Custom 20 2wd-350ci/4sp Manual
'99 2wd 5.7 Chevy Tahoe
Seattle, WA.
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