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We have an 03 2.5 XS auto and when towing up a long incline the box will drop down a gear and then change back up.If I press the o/d switch it will hold in that gear but the revs are up.Does anyone know if the box is controlled electronically and can it be modified to hold top gear longer? Thanks in advance,
Tom.
 

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2003 Kia Sorento
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The OD button is the way you hold the gear. When you're towing a heavy load, it's best not to ever let the transmission go into overdrive because the fluid will overheat and shorten the life of the transmission. If it's a lighter load, then it's alright.

In the '03, there's some technology built into the computer that "senses" when you're going up hills, so the down shift happens easier.
 
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