Overdrive saves more gas by keeping your cars rpms lower thereby saving gas
Overdrive will use more gas and put the car in a higher set of gears for more performance out of the transmission. Drive will just put the car in a regular set of gears for highway and road performance and save you a little bit of MPG, depending on whether you have a 3.4L V6, LT1, or a 5.7L V8 you'll notice a slight difference in power only out of the V6.
SOURCE: 95 camaro tranny problem
The fluild is suspect as is the compiter controls. Is the check engine lite on ? A bad TPS or air flow meter even if still working can command out of lock up. The fluild is at the right level and is halfway clean? The trans overheating now or in the past can have runied the lockup solinoid or the lock up clutch in the converter. Tranny shops like to rebuild the whole tranny every car as they know thats going to get it and they make more money and have less headaces with broken cars and mad customers. I f the control system cks OK Have your best guess local trusted tranny shop test drive the car and then listen to him say what hes going to do to fix it what hes going to charge and what'll happen if you don't fix it and drive around it. He may say he'll change just the touque converter and cross your fingers that it doesnt **** out too soon
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