Why shouldn't I get on it in OD?
TECH Addict
Joined: Oct 2003
Posts: 2,620
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From: Central, MA
No solid answer here...
Isn't 4th gear just a band that applies to 3rd? I always thought 3/D ONLY kept you out of 4th and tells the computer not to lockup the 'verter. Nothing else happens. It just doesn't allow those two things to take place.
For what it's worth, I use OD 75% of the time, and mat it everywhere. I'll only use 3/D when I'm in traffic doing speeds between 20 and 35, where the tranny is always bumping up and down gears.
Isn't 4th gear just a band that applies to 3rd? I always thought 3/D ONLY kept you out of 4th and tells the computer not to lockup the 'verter. Nothing else happens. It just doesn't allow those two things to take place.
For what it's worth, I use OD 75% of the time, and mat it everywhere. I'll only use 3/D when I'm in traffic doing speeds between 20 and 35, where the tranny is always bumping up and down gears.
TECH Addict
Joined: Sep 2003
Posts: 2,065
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From: Atlanta, GA
yeah i get lockup at 1000rpm in 3/D and 4/OD so i think OD has the free-wheel(wrong term) if you let off the gas the car doesn't engine brake? On the strip i can't imagine the stress that might occurr if your doing 117mph then let up causing the drivetrain to absorb the shock of letting off the gas and having 3 engine brake you down.
i could be totally wrong though. i was told to run in OD.
I can tell you for sure, my tailshaft housing broke in 3 on the dyno unlocked. not sure if thats because the car and dyno drums were fighting each other, but it was extra $$ to fix.
i could be totally wrong though. i was told to run in OD.
I can tell you for sure, my tailshaft housing broke in 3 on the dyno unlocked. not sure if thats because the car and dyno drums were fighting each other, but it was extra $$ to fix.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
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From: Troy, AL
I race in OD only. Why? Because the shifts seem to be quicker and with less slippage than in D. Going into OD at WOT is only a concern if racing to 135 MPH or so with 3.23 gears (stock tires and shift points.) With 2.73s it's not a concern until about 160.
Shifting from OD to D or D to OD is fine, IMO. And I've never managed to kill a tranny when slamming it WOT when in OD either. It's one of those things that *seems* like it's hard on the tranny....but who's toasted one by doing so?
Shifting from OD to D or D to OD is fine, IMO. And I've never managed to kill a tranny when slamming it WOT when in OD either. It's one of those things that *seems* like it's hard on the tranny....but who's toasted one by doing so?
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Verdad Gallardo TECH Addict
Joined: Sep 2003
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From: Atlanta, GA
given that the ecu controls the shifts, the amount of abuse is clearly at the controls of the programming. I spose one could program the ECM to shift safely or dangerously. you ever try throwing the tranny into 1 while doing 100mph? what happens?
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
Originally Posted by BigPlanTransAm
also, if you manually shift to first at ~35(the non kickdown area) and dont put it back to a higher gear fast enough it doesnt just hit the rev limiter, it will shift to second for you.
I don't manually shift anymore since I bought the new trans, but I did with the stock trans. I had the misfortune of not shifting quick enough on occasion and YES, it will bang the limiter and stay in 1st until YOU shift to the next gear. This I know for a fact. Joined: Nov 2001
Posts: 34,627
Likes: 2,541
From: Schiller Park, ILL Member: #317
Originally Posted by Colonel
I race in OD only. Why? Because the shifts seem to be quicker and with less slippage than in D. Going into OD at WOT is only a concern if racing to 135 MPH or so with 3.23 gears (stock tires and shift points.) With 2.73s it's not a concern until about 160.
Shifting from OD to D or D to OD is fine, IMO. And I've never managed to kill a tranny when slamming it WOT when in OD either. It's one of those things that *seems* like it's hard on the tranny....but who's toasted one by doing so?
Shifting from OD to D or D to OD is fine, IMO. And I've never managed to kill a tranny when slamming it WOT when in OD either. It's one of those things that *seems* like it's hard on the tranny....but who's toasted one by doing so?
So I guess we really aren't helping anything by running it in 3rd for WOT. I guess I'll just stick to OD then, unless someone has some hard facts that 3rd really is better for the trans.
Joined: Nov 2001
Posts: 34,627
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From: Schiller Park, ILL Member: #317
Originally Posted by Dear John
It's the 3-4 WOT shift bro. But you shouldn't need to go that fast dragging anyway.
I think the only issue with using OD is if you actually shift into OD going WOT. With my current tuning, I wouldn't hit OD at WOT until 132mph anyway, so I'm not really concerned about that
I don't think there is any reason to use 3rd from a stop for racing.
I don't think there is any reason to manually downshift to 3rd (from OD) before going WOT from a roll either.
Can anyone dispute that with hard facts? If so lets here it, cause I'd really like to know once and for all.
ok on my car.....theres 1st 2nd 3rd and Drive
my car has automatic overdrive...when im going form a stop...it goes through the gears......overdrive kicks in with the torque converter...so when im driving normally....it stalls at 1800-1900 and thats the overdrive....overdrive is your 4th gear from what i understand....better fuel economy thats all...cuz it runs lower RPM's...basically what cruise control does for your car...runs a good speed at lower RPM's thats OD...when you have your car in D and punch it it goes 1-2-3-4...
if your pacing at 30-35 or so...your overdrive will be kicked in...witht he stock TC...so its oin 3rd or 4the electronically....if you punch it our stock transmission downshifts automatically for better response so it drops too 2nd...like if your rolling at 25 o so yo can be in 3rd gear...you punch it and the trans will shift into 1st gear with the stock converter...
basically this....leave it in D if you have automatic OD....and also if your gonna race.......if you have OD and D...for racing use D (it has quicker acceleration) and if your just cruising or goin on the highway use OD...if they both show on the shifter.....
shifting from D(automatic OD)-3 is ok...may hammer a lil on the tran but not to bad.as long as your not over about 85...if your in OD if thats what your shifter has....i believe it goes...1-2-D-OD...dooooo noooooooooooot down shift....OD slows down more quickly then D does for some reason....mayb bcuz of the rpms it runs at whoooooo knos..
hopefully that helps and is understandable
my car has automatic overdrive...when im going form a stop...it goes through the gears......overdrive kicks in with the torque converter...so when im driving normally....it stalls at 1800-1900 and thats the overdrive....overdrive is your 4th gear from what i understand....better fuel economy thats all...cuz it runs lower RPM's...basically what cruise control does for your car...runs a good speed at lower RPM's thats OD...when you have your car in D and punch it it goes 1-2-3-4...
if your pacing at 30-35 or so...your overdrive will be kicked in...witht he stock TC...so its oin 3rd or 4the electronically....if you punch it our stock transmission downshifts automatically for better response so it drops too 2nd...like if your rolling at 25 o so yo can be in 3rd gear...you punch it and the trans will shift into 1st gear with the stock converter...
basically this....leave it in D if you have automatic OD....and also if your gonna race.......if you have OD and D...for racing use D (it has quicker acceleration) and if your just cruising or goin on the highway use OD...if they both show on the shifter.....
shifting from D(automatic OD)-3 is ok...may hammer a lil on the tran but not to bad.as long as your not over about 85...if your in OD if thats what your shifter has....i believe it goes...1-2-D-OD...dooooo noooooooooooot down shift....OD slows down more quickly then D does for some reason....mayb bcuz of the rpms it runs at whoooooo knos..
hopefully that helps and is understandable
Joined: Nov 2001
Posts: 34,627
Likes: 2,541
From: Schiller Park, ILL Member: #317
Originally Posted by 02WS6Bird
ok on my car.....theres 1st 2nd 3rd and Drive
my car has automatic overdrive...when im going form a stop...it goes through the gears......overdrive kicks in with the torque converter...so when im driving normally....it stalls at 1800-1900 and thats the overdrive....overdrive is your 4th gear from what i understand....better fuel economy thats all...cuz it runs lower RPM's...basically what cruise control does for your car...runs a good speed at lower RPM's thats OD...when you have your car in D and punch it it goes 1-2-3-4...
if your pacing at 30-35 or so...your overdrive will be kicked in...witht he stock TC...so its oin 3rd or 4the electronically....if you punch it our stock transmission downshifts automatically for better response so it drops too 2nd...like if your rolling at 25 o so yo can be in 3rd gear...you punch it and the trans will shift into 1st gear with the stock converter...
my car has automatic overdrive...when im going form a stop...it goes through the gears......overdrive kicks in with the torque converter...so when im driving normally....it stalls at 1800-1900 and thats the overdrive....overdrive is your 4th gear from what i understand....better fuel economy thats all...cuz it runs lower RPM's...basically what cruise control does for your car...runs a good speed at lower RPM's thats OD...when you have your car in D and punch it it goes 1-2-3-4...
if your pacing at 30-35 or so...your overdrive will be kicked in...witht he stock TC...so its oin 3rd or 4the electronically....if you punch it our stock transmission downshifts automatically for better response so it drops too 2nd...like if your rolling at 25 o so yo can be in 3rd gear...you punch it and the trans will shift into 1st gear with the stock converter...
Originally Posted by 02WS6Bird
basically this....leave it in D if you have automatic OD....and also if your gonna race.......if you have OD and D...for racing use D (it has quicker acceleration) and if your just cruising or goin on the highway use OD...if they both show on the shifter.....
shifting from D(automatic OD)-3 is ok...may hammer a lil on the tran but not to bad.as long as your not over about 85...if your in OD if thats what your shifter has....i believe it goes...1-2-D-OD...dooooo noooooooooooot down shift....OD slows down more quickly then D does for some reason....mayb bcuz of the rpms it runs at whoooooo knos..
hopefully that helps and is understandable
shifting from D(automatic OD)-3 is ok...may hammer a lil on the tran but not to bad.as long as your not over about 85...if your in OD if thats what your shifter has....i believe it goes...1-2-D-OD...dooooo noooooooooooot down shift....OD slows down more quickly then D does for some reason....mayb bcuz of the rpms it runs at whoooooo knos..
hopefully that helps and is understandable
I really don't think there are any hard facts to prove that "D" (3rd) is any better for power or easier on the trans than "OD" (4th). Again, if there is I'm sure we'd all like to see it.