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Discussion Starter #1
We just purchased a 2004 Sonata with an automatic tranny. I know on some cars there's a button for engaging and disengaging the overdrive - is there one on mine, and if so, where is it ? I thought there would be a light or something on the dash that would light-up showing what the status of it is.

Thanks in advance for any help.
 

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There is no actual button for the OD, but you use the autostick mode. After moving the gear selecter to drive, you can push it to the right between the + and the -. While accelerating, push the gear selecter up (twards the +) and the transmission will shift up and when stopping, you can push it down (twards the -) but it will shift down automaticly. For example if you are going up a hill and want to shift down to have more power, just simply move the gear selecter to the autostick position (the the right) and push it down (twards the -) and it will shift down, and when you want to shift up again just move it up to the + or back to D. So an OD button is not necissary

EDIT- there is a light on the dash next to the D that tells you what number gear you are in
 
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Discussion Starter #3
OK, that's what I was thinking (after having just been out driving it and going through the gears). So I'm guessing 1 thru 3 are like L1, L2, and D and 4 is the final drive/OD. Does that sound about right ? It's been quite a while since I've owned an auto, man they've advanced :)

Thanks for your help !
 

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My Hyundai sonata which is a 2003 does not have a OD button. On my dashboard it says ODO. Is that on or off? How do I turn it on?
 

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If RPMs drop by 1-2% whilst staying in 4th this is the torque converter locking. 'Overdrive' is technically nothing else than switching from 3rd to 4th on a 4-speed A/T. Early 4-speed A/T are just classic 3-speeds (usually a Simpson planetary gearset) with an additional planetary gear for the overdrive functionality. Later ones like the F4A4x in question are more modern Ravigneaux/Lepelltier-gearset based, thus have no distinct 'Overdrive'-section working on 3rd gear only (making it gear #4). By design of such A/T and its control, an extra O/D off button is kinda pointless ...
 
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