the D with the circle around it (overdrive) or the ordinary D, which is better?
#2
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
The D with the circle is Overdrive gear (4th gear) and is easier on gas mileage.
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
well its just a lower gear, just like 1st gear is lower than second gear thats all. overdrive is great for just crusing around and highway use because a higher gear lowers the rpms the motor spins at and therfore saves gas and allows fo a higher top speed.
so if you stick your car in drive it will act liek a 3 speed trans, and top out sooner.
if you use overdrive it will act the same as drive but have one extra gear.
so if you stick your car in drive it will act liek a 3 speed trans, and top out sooner.
if you use overdrive it will act the same as drive but have one extra gear.
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
You really need to sit down with your dad and have a frank discussion about cars. Not trying to be rude necessarily, but you should know this when you get your drivers license at age 16.
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
or if you want to be like the foxbody rustang guys just stick it in 2 and hammer down... but loads of torque
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
Better yet do what I do, Manual shift that tranny. Sure you'll kill it faster but hey you gotta have an excuse to get a new one.
#9
Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
the guy who wrote that quote is from Calgary, which when last time I looked was also in Canada. lol, but ya I was just curious to see if it was different from Dodge... apparently not.
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
Sonix has a point, understand how the gears of a transmission work. Overdrive is an extra gear, and does not affect the acceleration of the first three.
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
if you dont go into overdrive, your torque converter wont lockup and you will have crappy gas mileage. thers a bunch of other factors that are taken into account when the converter is locked up, but no OD is the #1 on the list.
and its no fun shifting manually on an automatic anyways because the auto tranny shifting is governed by oil pressure and throddle position. get a manual valve body, then get some F1 style paddle shifting and have at er'
and its no fun shifting manually on an automatic anyways because the auto tranny shifting is governed by oil pressure and throddle position. get a manual valve body, then get some F1 style paddle shifting and have at er'
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
A stock 700R4 will upshift at redline regardless of what position the manual shaft is in.
----------
The ECM will still lock the TCC normally with the selector in Drive.
The only major difference between the D and O/D positions (apart from preventing shifting into 4th) is that the overrun clutch will provide engine braking in all gears in D instead of allowing coasting in O/D.
----------
The only major difference between the D and O/D positions (apart from preventing shifting into 4th) is that the overrun clutch will provide engine braking in all gears in D instead of allowing coasting in O/D.
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
#17
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
mine shifts at 5300 rpm, well used to till my moter blow up last night... man i feel sick
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
..and it will also downshift out of OD at >1/4 pedal, limiting your top speed to whatever you can do in 3rd gear.
Edit: Apeiron, you're a mod now? Wow, congrats!
Edit: Apeiron, you're a mod now? Wow, congrats!
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
how in the hell did they get a name like that?
though still not as good is intercourse, PA you have to drive by blue ball to get there though. sad thing is they are both true names for cities
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
ok just out of curiousity in new foundland do you know what the story is behind the city named *****?
how in the hell did they get a name like that?
though still not as good is intercourse, PA you have to drive by blue ball to get there though. sad thing is they are both true names for cities
how in the hell did they get a name like that?
though still not as good is intercourse, PA you have to drive by blue ball to get there though. sad thing is they are both true names for cities
It's named for the ***** river, stupid. :P
No, really:
Originally Posted by Wikipedia
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
now just hold on...the shift happens when oil preasure governed by the TV cable overcomes the preasure governed by the pump. so if you put it in 1st, you block that TV oil preasure from entering the system so it wont shift. if your tranny shifts, you may have a bad seal somewhere.
FYI, ive gone to about 6.5G's with my first 305 and it never shifted. besides...your tranny doesnt know what your engines redline is anyways...how can it govern when to shift?
FYI, ive gone to about 6.5G's with my first 305 and it never shifted. besides...your tranny doesnt know what your engines redline is anyways...how can it govern when to shift?
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
Most of the stock 700-R4's WILL shift when in first. The shifts will happen as they would at WOT. It will also not allow you to downshift into too low a gear. I found this out during a panic stop and downshift at 90 MPH. Accidentally stuck it in first gear, and IIRC it only went into 2nd.
Also, the advantage of D vs. OD is that D is just a straight shot through the trans (both planitary sets locked), so there is less heat generation and wear.
Also, the advantage of D vs. OD is that D is just a straight shot through the trans (both planitary sets locked), so there is less heat generation and wear.
Last edited by dimented24x7; 04-05-2007 at 12:51 PM.
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
I Have also found over the years ( just something I noticed ...not gospel) That when in town keep it in just D .... that way the tranny isn't always shifting back and forth with the little throttle inputs it takes to get around town . SO I say when in town ...keeping it in D is a bit easier on the tranny .
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
I Have also found over the years ( just something I noticed ...not gospel) That when in town keep it in just D .... that way the tranny isn't always shifting back and forth with the little throttle inputs it takes to get around town . SO I say when in town ...keeping it in D is a bit easier on the tranny .
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
#29
Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
I don't mean to be rude but your dad must have forgotten he was your dad and not your mom when he taught you to drive an automatic at all lmao. This is my 6th car and the first one that is an automatic. Some of us in this forum are men FYI
#30
Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
Anyone who doesn’t understand the concept of gearing vs acceleration (including overdrive) needs to pedal a 10 speed bicycle in a hilly area. It won’t take long to figure it out.
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
if you dont go into overdrive, your torque converter wont lockup and you will have crappy gas mileage. thers a bunch of other factors that are taken into account when the converter is locked up, but no OD is the #1 on the list.
and its no fun shifting manually on an automatic anyways because the auto tranny shifting is governed by oil pressure and throddle position. get a manual valve body, then get some F1 style paddle shifting and have at er'
and its no fun shifting manually on an automatic anyways because the auto tranny shifting is governed by oil pressure and throddle position. get a manual valve body, then get some F1 style paddle shifting and have at er'
2. Saaaay wha....?? What's the inner workings of the trans got to do with the fun of manually shifting it? You DO know that when manually shifting, the trans isn't "governed by oil pressure and throddle position"...it's governed by your hand.
Last edited by Tom 400 CFI; 04-20-2022 at 02:23 PM.
#32
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
All Transmission Models are different an have different usage recommendations, but regarding THM700-4R Transmissions and the 4L60E Family of Transmissions (60E, 65E, 70E, and 75E):
The THM700-R4 Transmission should never be used in the OD/ D4 Gear-Selector Position for Full-Throttle/ Heavy-Throttle use.
It is easy to over-power the Input-Sprag.
Use the D/ D3 Gear-Selector Position for Full-Throttle/ Heavy-Throttle use (or the M2/ D2 and M1/ D1 Positions as well).
Between 1982 through 2014 The THM700-R4 and it's Electronically Controlled Variant (The 4L60E/ 65E/ 70E/ 75E) the Input-Sprag has been Updated-Upgraded FIVE Times.
The Original Part was actually a One-Way Roller-Clutch and NOT an actual Sprag Assembly.
It was a 12-Element One-Way Roller-Clutch for 1982 ONLY.
-1983: First Update-Upgrade to a 26-Element Sprag Assembly.
-1987: Second Update-Upgrade to a 28-Element Sprag Assembly.
-1993: Third Update-Upgrade to a 29-Element "Single-Cage" Sprag Assembly.
-1995: Fourth Update-Upgrade to a 29-Element "Dual-Cage" Sprag Assembly.
-2005 - 2008: (GM has conflicting Documentation regarding this)...
Fifth Update-Upgrade to a 29-Element "Dual-Cage" Sprag Assembly with 12.7% Larger Elements.
While these Updates-Upgrades have made a tremendous difference...
My Original Statement still applies:
The THM700-R4 Transmission should never be used in the OD/ D4 Gear-Selector Position for Full-Throttle/ Heavy-Throttle use.
When the First Model of the THM700-R4 (Model-Year 1982) was designed in the Late-1970s through Early-1980s...
It only had the 1982 Corvette to worry about as far as "High Performance" Vehicles at that time.
In 1982 the Corvette Engine produced a "Massive" 200 HP and 285 Ft/ Lbs of Torque for a 3,200 Lb Car.
The Input-Sprag Updates-Upgrades have allowed for significantly more Power to be put through the Transmission, But...
Still ONLY Use the D/ D3 Gear-Selector Position for Full-Throttle/ Heavy-Throttle use (or the M2/ D2 and M1/ D1 Positions as well).
This does not apply to the 4L60E Family of Transmissions.
The Ideal/ Safest way to operate the Transmission (trying not to destroy it) is by Manually going from D1 to D2 and then to D3 for Full-Throttle/ Heavy-Throttle use.
If anyone desires to be able to use the 4L60E Family of Transmissions in the same manor as the THM700-R4...
One Aftermarket Upgrade is Required:
The Sonnax HD 2-3 Shift-Valve (Remove OEM 2-3 Shift-Valve, Drill one Hole in Valve-Body Casting, Clean, and Install Sonnax HD 2-3 Shift-Valve)
Very easy to do!
The THM700-R4 Transmission should never be used in the OD/ D4 Gear-Selector Position for Full-Throttle/ Heavy-Throttle use.
It is easy to over-power the Input-Sprag.
Use the D/ D3 Gear-Selector Position for Full-Throttle/ Heavy-Throttle use (or the M2/ D2 and M1/ D1 Positions as well).
Between 1982 through 2014 The THM700-R4 and it's Electronically Controlled Variant (The 4L60E/ 65E/ 70E/ 75E) the Input-Sprag has been Updated-Upgraded FIVE Times.
The Original Part was actually a One-Way Roller-Clutch and NOT an actual Sprag Assembly.
It was a 12-Element One-Way Roller-Clutch for 1982 ONLY.
-1983: First Update-Upgrade to a 26-Element Sprag Assembly.
-1987: Second Update-Upgrade to a 28-Element Sprag Assembly.
-1993: Third Update-Upgrade to a 29-Element "Single-Cage" Sprag Assembly.
-1995: Fourth Update-Upgrade to a 29-Element "Dual-Cage" Sprag Assembly.
-2005 - 2008: (GM has conflicting Documentation regarding this)...
Fifth Update-Upgrade to a 29-Element "Dual-Cage" Sprag Assembly with 12.7% Larger Elements.
While these Updates-Upgrades have made a tremendous difference...
My Original Statement still applies:
The THM700-R4 Transmission should never be used in the OD/ D4 Gear-Selector Position for Full-Throttle/ Heavy-Throttle use.
When the First Model of the THM700-R4 (Model-Year 1982) was designed in the Late-1970s through Early-1980s...
It only had the 1982 Corvette to worry about as far as "High Performance" Vehicles at that time.
In 1982 the Corvette Engine produced a "Massive" 200 HP and 285 Ft/ Lbs of Torque for a 3,200 Lb Car.
The Input-Sprag Updates-Upgrades have allowed for significantly more Power to be put through the Transmission, But...
Still ONLY Use the D/ D3 Gear-Selector Position for Full-Throttle/ Heavy-Throttle use (or the M2/ D2 and M1/ D1 Positions as well).
This does not apply to the 4L60E Family of Transmissions.
The Ideal/ Safest way to operate the Transmission (trying not to destroy it) is by Manually going from D1 to D2 and then to D3 for Full-Throttle/ Heavy-Throttle use.
If anyone desires to be able to use the 4L60E Family of Transmissions in the same manor as the THM700-R4...
One Aftermarket Upgrade is Required:
The Sonnax HD 2-3 Shift-Valve (Remove OEM 2-3 Shift-Valve, Drill one Hole in Valve-Body Casting, Clean, and Install Sonnax HD 2-3 Shift-Valve)
Very easy to do!
Last edited by vorteciroc; 11-12-2023 at 09:51 PM.
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T.L. (11-12-2023)
#37
Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
If it was that important to know before getting a license they'd put it in the DMV handbooks but they don't so saying "you should know this when you get your license" doesn't make sense also not everyone drives a manual
#39
Supreme Member
Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
This thread again. I forgot this was where the guilt comes from when I annihilate my rear tires in a busy city intersection and forget to drop it in D first.
#40
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Re: the D with the circle around it (overdrive) or the ordinary D, which is better?
I love that 3 different people were so triggered by this thread that they created an account just to reply, then abandoned the forum.
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T.L. (02-01-2024), Tom 400 CFI (02-01-2024)
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