2006 Kia Spectra transmission will not have overdrive once it jerked. Usually RPM is at 2500 when driving up to 70 mph; but after it jerked, RPM will stay over 3000 when driving over 50mph, also it will start driving at low gear and no overdrive. After stopping and overnight, it will be starting normal until next jerk came. What are thw issues and solutions?

SOURCE: transmission flares / slips on

I had the same issue and bought some sea foam transmission fluid product and it seems to have worked. Just be careful not to overfill it.

SOURCE: spedometer and high rev problem : 2002 kia spectra

sounds like the electronic speedometer cable, look around the trans for any wiring that may have gotten burnt

SOURCE: 2003 kia spectra check engine code p0604

I have bad news for you
p0604 is a transmission control module

check the connection at the transmission control module if there are no connection issues than you will need to replace the transmission controll module "tcm" there is no other test for that code.

good luck

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SOURCE: Transmission is jerking violently then will not

That sounds like solenoid problems if this is an electrically controlled transmission. Fluid and filter change will likely NOT fix this. Flushing and filter change is preventive, not repair. Is the check engine light on? If so, rent a scanner and read the code(s). It should point out problems with transmission control. You likely need the services of a good transmission repair facility (many penny!).

SOURCE: The transmission on my 2006 Kia Spectra makes a

you need to put foreign additive in your transmission.. these places that change your fluid do not do that when they change fluid