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Old 03-03-2002, 12:47 PM
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drive vs overdrive

i own a 1988 buick century with over drive and i want to know if driving in over drive is the best for everyday driving or is it better or use drive for that? i was told by a mechanic to use overdrive for everyday driving and use drive for highway driving and towing. it didnt sound write to me and now i have trans trouble. shifting trouble at 35mph-55mph. slipping shuttering. then it runs smooth at 55 and over. any suggestions would be great. thanks... mel(loonybird69)
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Old 03-03-2002, 04:18 PM
76 Mustang II 76 Mustang II is offline
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under normal street conditions....20-45 mph stop and go I would use drive. The third gear (or drive) on an overdrive transmission is usually 1:1 ratio (which means that the tranny and rear end are moving at the same speed). Overdrive is usually in the neighborhood of .75:1 (tranny moving 1/4 slower than rear end, in effect; if you had a 3.55:1 rear end, making the car operate as if you had a 2.79 rear end) which is great for gas mileage on drives under highway conditions....longer distances 45-75 mph.
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Old 03-03-2002, 09:52 PM
danny danny is offline
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i wonder why they are called automatic transmissions if you have to shift them? kinda takes the automatic appeal out-sorry just thinking out loud lol
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Old 03-04-2002, 09:24 AM
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ha ha

OD is for highway and D is for the city!
OD is a top gear. If it was a manual, would you drive 40mph in the highest gear? no, but thats what driveing in OD does!
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Old 03-04-2002, 02:32 PM
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When I'm driving a vehicle like this (trucks in my case) I leave it in OD, the trans shouldn't shift into overdrive unless the speed is high enough and the load is light enough.

That being said, when going up big hills shifting out of overdrive can keep the trans from shifting in/out over and over.

just my 2cents worth.

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