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This transaxle is the CD4E 4 speed. If the terrain or throttle pressure are not changing much, it would be odd to shift often from 3rd to 4th and back. It may be a incorrect reading throttle position sensor that a scan tool can monitor. It may be the torque converter clutch slipping. I would drain the trans oil. Add*****it for one day, then drain and fill it again, but this time add a bottle of LUBEGARD. If its the converter, then this should resolve it within 50 miles.
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