Yea - you will probably be alright. Just get it between the marks the next chance you get. The way I change tranny fluid I pour what comes out into some clear gallon jugs and estimate about how much I got out then put that much back in less approximately 1/2 quart. After getting the car up to temp I add just a little bit at a time till it is between the marks. It does not take much between the bottom mark and the top one.

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Jim