O/D light flashing is computer indicating an issue with the transmission -no surprise. Make sure the transmission fluid is still good (dosn't smell burnt, right level). Slipping could be the TCC (torque Converter clutch) - not a cheap part - but would only really slip in 4th gear (above 40 mph). Slipping before that could be numerous things in the trans (low fluid pressure, torque converter issues).
I would be tempted to replace the fluid anyhow, but there is a chance an expensive issue is starting to arise - and replacing the fluid on a failing transmission could cause it to fail 100% (or can fix it nearly 100%). These can be touchy transmissions, too much DIY without the right diagnostic tools can be bad. Not what you wanted to hear, and not an expert, but have had some expertise with these.hope that helps.
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n flushed it drove good for 4 days then it wasn't pulling so go and my od light keeps flickering what do you think is the problem now
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