1:
"Sounds like the Torque Convertor locking up. Many people refer to this
as the overdrive. You should also feel it when you give it more gas or go up a sight hill. The RPM's will jump about 500. If you didn't have the transmission flushed at 30k it would be wise to do this ASAP. Some people say the trans shifting will get more noticable as the fluid gets old. And make sure you only have it changed at the Hyundai dealer and make sure they are using the SP III fluid only."
Reply:
I'm recall manual overdrives in some 1950s vehicles.
We've been doing whatever the Elantra owners manual requires
re: specifically, change/flush of the transmission fluid
I think it was done, and will now follow-up with specific inquiry at dealer which would be in their computer records too.
THANKS