That's wierd. My 400 was overfilled once on accident, and it never belched out the dipstick tube.
What I meant by detent is does it shift ok when you kick down into lower gears under harder acceleration? Maybe one of your servos is refusing to actuate, and is causing significant back-pressure??? or you have some kind of problem with your valve body...just a guess.
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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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