Q: when the automatic transmission shifts into overdrive it slips on 2004 Mercury Grand Marquis

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When I drive with overdrive deployed, it will slip when shifting into overdrive and then after the rpms go high enough, it will there some kind of an adjustment that can be done or do i need a new transmission....Shifting is fine with all the other i have been driving with the overdrive switched off and all is working well....
(1) Answer
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running low in fluid is the main cause for overdrive failure. there is no adjustment for this. you will need major work for this one

Thats wrong master tech i have one doing the same thing and my trans oil is full