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  #1  
Old 07-08-2009
Tys 4x4 FTW's Avatar
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always wondered this

just because my grand prix doesnt have an OD off button or anything. so i have no experience with it.

but what does it do when i turn overdrive off? moreso, whats the point of doing it is what im trying to ask.

thanks lol
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Old 07-08-2009
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it basically turns off 5th gear. I know in chevy fullsizes, it changes the shift points for better towing acceleration. May have something to do with torque converter lockup as well. It's a truck thing.
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Old 07-08-2009
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ya i thought it was just for trucks and towing? the dodges do the same as chevy
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Old 07-08-2009
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yeah i guess my dads truck has it

cept its the "tow haul" button

firms up the shifts, and as you slow down it downshifts so that your gears help slow you down. pretty sweet.
i have noticed some firmer shifting in my truck when i use it, and it downshifts a bit quicker..
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Old 07-08-2009
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its not just a truck thing.. My old Tbird had it, and my dad's 96 tbird does aswell..
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  #6  
Old 07-08-2009
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99 toyota avalon has an OD button... dont a lot of cars have them?
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Old 07-08-2009
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Quote:
Originally Posted by The_Punisher View Post
99 toyota avalon has an OD button... dont a lot of cars have them?
Yes pretty much every car and truck have them. All the automatic vehicles I've driven or owned have had an OD button.
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Old 07-08-2009
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my grand prix doesnt have one

but the earlier models of that gen did lol
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Old 07-08-2009
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Unless you're cruisin in town, riding with the OD off is going to give you bad mileage.

Last edited by rangerboy101; 07-08-2009 at 08:43 PM.
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Old 07-08-2009
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yeah it changes the shift points and gives you better gas mileage when on. I only turn it off like on the highway where its hilly, or I want to pass. With it off it stays in gear a lil longer I believe,
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Old 07-08-2009
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Ya my brothers 2001 ZX3 has OD, but my moms 2003 Odyssey doesn't. Can you use it on the fly or do you have to be in park to turn it off.
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Old 07-08-2009
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I like to push my o/d button going up a really big hill and blow past a dodge, toyota, or chevy truck.
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  #13  
Old 07-08-2009
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od just keeps your rpms down.

you take it off if your towing esp in hilly areas because if your towing with it on the tranny is shifting back and forth for power and thats not good on it at all.
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Old 07-08-2009
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ok if it doesnt have a button, when you put it in gear, what do you put it on the "D" with a circle around it for overdrive, beside that is there just a plain "D"???, i know my gfs escort does NOT have a OD button, but you can euther put the gear in OD or D...
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Old 07-08-2009
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Quote:
Originally Posted by Mark98xlt View Post
od just keeps your rpms down.

you take it off if your towing esp in hilly areas because if your towing with it on the tranny is shifting back and forth for power and thats not good on it at all.
Exactly. It's simply a way to keep the tranny from jumping between OverDrive and Drive repeatedly in hilly areas (where you'd jump into Drive going up hill and drop back down in when going downhill).

I know I used to use it when I was had my Cruise Control on when I would come to a big hill on the freeway. The tranny shifted smoother going back down to Drive if I did it before the hill rather then just letting it shifted on it's own once I was on the hill.
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Old 07-08-2009
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Quote:
Originally Posted by dixie_boysles View Post
ok if it doesnt have a button, when you put it in gear, what do you put it on the "D" with a circle around it for overdrive, beside that is there just a plain "D"???, i know my gfs escort does NOT have a OD button, but you can euther put the gear in OD or D...
That is not OD, the D with the circle around it is drive, and the plain D is basically just 3rd gear. My dads old BII had that.
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Old 07-08-2009
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From what i have heard (correct me if i'm wrong), with overdrive the output shaft of the transmission which goes to the drive shaft is spinning faster than the torque converter which keeps your engine rpm down (over driving).
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Old 07-08-2009
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Hmmm I wounder I just went out and checked my sis's 2004 Buick Regal (very simmilar drive train to a regular Grand Pix) and the shift pattern goes P R N D 3 2 1. I know she only has a 4 speed auto for a tranny (3 gears and an overdrive) so i believe that if you were to shift into 3 to would be the same as turning the OD off.
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Old 07-08-2009
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Quote:
Originally Posted by Tys 4x4 FTW View Post
just because my grand prix doesnt have an OD off button or anything. so i have no experience with it.

but what does it do when i turn overdrive off? moreso, whats the point of doing it is what im trying to ask.

thanks lol
Default operation is with the O/D enabled (1st through 5th gear available). If the driver cancels the O/D, two changes are made that can be beneficial when towing:

1) automatic shifting is allowed in gears 1 through 4. By locking out 5th gear, it greatly reduces shift hunting at highway speeds.

2) when the O/D is canceled, the transmission's Coast Clutch is applied in 4th gear, making engine braking available. (The Coast Clutch is not applied in 4th or 5th in the default O/D ON mode.)

Without a trailer: O/D Cancel can often provide the same benefits when driving on roads through hilly/mountainous terrain with no trailer. Fuel economy will suffer at speeds above about 45 MPH on flatter roads, so it's a good idea to use O/D Cancel only when needed.
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Old 07-08-2009
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Quote:
Originally Posted by 87ranger302 View Post
From what i have heard (correct me if i'm wrong), with overdrive the output shaft of the transmission which goes to the drive shaft is spinning faster than the torque converter which keeps your engine rpm down (over driving).
From what I know, this is correct. Usually Overdrive means that you have less the 1:1 to ratio.

Quote:
Originally Posted by RamgermasterKC View Post
Hmmm I wounder I just went out and checked my sis's 2004 Buick Regal (very simmilar drive train to a regular Grand Pix) and the shift pattern goes P R N D 3 2 1. I know she only has a 4 speed auto for a tranny (3 gears and an overdrive) so i believe that if you were to shift into 3 to would be the same as turning the OD off.
No. In this case you probably just don't have an overdrive. Drive is your 4th gear and that is probably a 1:1 ratio.

EDIT: I sort of stand corrected. It appears some times that Overdrive can be a 1:1 to ratio as well:

Quote:
Originally Posted by Wiki
How an overdrive unit works

The overdrive consists of an electrically or hydraulically operated epicyclic gear train bolted behind the transmission unit. It can either couple the input driveshaft directly to the output shaft (or propeller shaft) (1:1), or increase the output speed so that it turns faster than the input shaft (1:1 + n). Thus the output shaft may be "overdriven" relative to the input shaft. In newer transmissions, the overdrive speed(s) are typically as a result of combinations of planetary/epicyclic gearsets which are integrated in the transmission. In these cases, there is no separately identifiable "overdrive" unit. A number of such transmissions and transaxles are manufactured by Aisin, for use in vehicles produced by many different manufacturers. In older vehicles, it is sometimes actuated by a **** or button, often incorporated into the gearshift ****, and does not require operation of the clutch. Newer vehicles have electronic overdrive in which the computer automatically adjusts to the conditions of power need and load.
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Old 07-08-2009
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Been waiting for a textbook answer...Thanks Bob!
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Old 07-08-2009
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i kno when i used it on a shop truck when i was younger, i was able to turn off the O/D and like posted, the engine would slow me down. i'd be able to slow down 10 kms/h just by hitting that little button.
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Old 07-08-2009
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Quote:
Originally Posted by ClemsonRanger03 View Post
That is not OD, the D with the circle around it is drive, and the plain D is basically just 3rd gear. My dads old BII had that.
That technically is OD since OD allows the tranny to go into top gear which is 4th in this case.
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Old 07-08-2009
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i'm with christian on this, older cars only had 4 speeds. the D with the circle is overdrive. the circle was an O. your dad's old BII probebly only had three speeds plus a fourth O/D.
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Old 07-08-2009
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i knew that was D with an o around it was overdrive and and standalone D is drive.....doubting myself for a minute...the the original OB, does ur grandprix have the same setup as my gf's escort: a D with an o around it, and jsut a stan alone D that you can select with the gear select?

i know you were mostly wondering "how" overdrive works, but im just curious b/c you said you didnt have "an overdrive button or anything"
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