Q: It's a 2003 Hyundai Elantra automatic. It has these options: D 2 3 L I drove in L and the cars RPM's go very high when I gun to 45mph but the car accelerates as fast as when it's in Drive or D. Would 2 or 3 make the car accelerate faster? And which transmission makes the car accelerate the quickest from around 40-100mph.
A: Not Which transmission. Which Gear? That should be your question. You have an automatic transmission. L is first gear. It is what you use if you are towing something going up a hill slowly. You can't go past 20mph with this. It is bad for engine. D does this automatically. 2 is 2nd gear 3 is 3rd gear. D is 1st to 4th gear. It automatically switches for you from L to 2 to 3 to 4th gear. The highest gear goes fastest. Just leave it in D. Manually changing the other gears in an automatic transmission is bad and will make the car break down sooner.