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What exactly is overdrive?

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  #1  
Old 02-18-2006
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What exactly is overdrive?

i know that it downshifts the engine but i dont know how, or what it does persay....

any help.?
 
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Old 02-18-2006
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Overdrive is the fifth gear of the transmission, the only gear that spins the output shaft faster than the input shaft.

The overdrive cancel button on the end of the shifter stalk prevents the transmission from shifting into 5th gear (OD) and also commands engine braking in 4th gear (D). Useful for towing and driving on mountain roads.
 
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Old 02-19-2006
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so for long freeway drives should it be on or off? im a sped lol
 
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Old 02-19-2006
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Originally Posted by edge05runner
so for long freeway drives should it be on or off? im a sped lol
No for like Freeway driving like flat stuff u want the O/D on.
 
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Old 02-19-2006
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leave the OD on all the time. i would only turn it off for towing, to get some extra engine breaking, and for accelerating faster
 
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Old 02-19-2006
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The transmission defaults to O/D-allowed everytime you start the engine. Your truck makes the best fuel economy with the O/D-allowed, especially on the highway.

There is no need to turn the O/D off unless you need the extra engine braking for towing or driving hilly/mountain roads.

Remember- when the O/D light is off, overdrive operation is allowed and when the O/D light is on, overdrive is not allowed.
 
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Old 02-19-2006
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your forth gear is a 1:1 ratio ... when in overdrive the ratio goes to 1:0.8
 
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Old 02-20-2006
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Originally Posted by Rangerboy03lvl2
your forth gear is a 1:1 ratio ... when in overdrive the ratio goes to 1:0.8
Ranger automatics have a bit taller overdrive ratio than the manuals.

Mazda Manual - 1 : 0.79
5RxxE Automatic - 1 : 0.75
 
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  #9  
Old 02-20-2006
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overdrive is never to be used when towing or plowing.

^^its not just a 5th gear, mine is the 4th gear^^
 
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Old 02-20-2006
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^^ isnt OD specificly for towing.... ive always heard thats when your supposed to use it...
 
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Old 02-20-2006
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No. OD is for saving gas milage by dropping RPMs as low as you can go.
 
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Old 02-20-2006
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Originally Posted by 4X2XLT
^^ isnt OD specificly for towing.... ive always heard thats when your supposed to use it...
The confusion here is about what the term overdrive means and what the O/D OFF light means.

O/D-enabled is for everyday use. Whenever you start your engine, the transmission controls default to this mode. It allows your truck to shift into all gears including 5th gear (AKA overdrive).

O/D-off (or O/D-cancel) turns the overdrive off and it turns the O/D OFF light on. Your truck can use gears 1 through 4 but 5th gear is locked out (overdrive is not allowed).


O/D-off can be useful for towing because it prevents 4-5 gear hunting and provides engine braking in 4th gear.

The button on the end of the shifter stalk allows you to toggle between O/D-enabled and O/D-off modes.
 
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Old 02-20-2006
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ok yea i keep thinking taht overdrive OFF is termed overdrive lol...i understand now
 
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Old 02-21-2006
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OD is a 4th gear plus it lets the torque convertor to lock up; dropping the rpms by 15% to 30%. never use OD while towing or you'll burn out the tranny. For a manual OD is the 5th gear.. nothing special.
 
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Old 02-21-2006
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Originally Posted by rnger2point9
OD is a 4th gear plus it lets the torque convertor to lock up; dropping the rpms by 15% to 30%.
That depends on the year of the truck. The OP's truck has a 5 speed automatic, so his overdrive gear is 5th gear. The Torque Converter Clutch can be engaged on command from the PCM in gears 2, 3, 4, and 5.
 

Last edited by V8 Level II; 02-21-2006 at 03:05 PM.
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Old 02-21-2006
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i turn off OD only when i'm on the bottle... its on the rest of the time.
 
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Old 02-21-2006
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Originally Posted by rwenzing
The confusion here is about what the term overdrive means and what the O/D OFF light means.

O/D-enabled is for everyday use. Whenever you start your engine, the transmission controls default to this mode. It allows your truck to shift into all gears including 5th gear (AKA overdrive).

O/D-off (or O/D-cancel) turns the overdrive off and it turns the O/D OFF light on. Your truck can use gears 1 through 4 but 5th gear is locked out (overdrive is not allowed).


O/D-off can be useful for towing because it prevents 4-5 gear hunting and provides engine braking in 4th gear.

The button on the end of the shifter stalk allows you to toggle between O/D-enabled and O/D-off modes.

Well said Bob, I was about to reply and I decided.. "Bob has it covered"

Rand
 
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Old 12-11-2008
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Originally Posted by rnger2point9 View Post
OD is a 4th gear plus it lets the torque convertor to lock up; dropping the rpms by 15% to 30%. never use OD while towing or you'll burn out the tranny. For a manual OD is the 5th gear.. nothing special.
I sure wish my manual was a 6 speed! With a 4.10 rear end 75 mph is not gas friendly...

Are there any aftermarket overdrives available for a 5 speed manual???

Robert
 
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  #19  
Old 12-11-2008
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I use overdrive when towing. I only turn if off if the engine is struggling or shifts too much.
 
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Old 12-11-2008
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christ this thing is 3 years old
 
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  #21  
Old 12-11-2008
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Holy Crapper! I never even noticed
 
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Old 12-12-2008
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Holy bringing back the dead batman
 
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