I believe that the solenoid that controls the overdrive is accessable from the transmission pan area. The solenoids that control the shifting are located in the side. The 4t65e transaxle has been known to have problems with overdrive for more than one reason though, so start with that solenoid. If that doesn't work, you may have luck with a shift kit. My car used to shift rapidly in and out of overdrive, after I installed a shift kit, I have had no further issues. I used the '4t65e sk' kit from TransGO.
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