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Is there any advantage to shift from/to D3 to D on an automatic transmission in our vics? If your racing, and u floor the gas, the tranny automatically shifts at optimum points, right?
In 2, the tranny will only use 2nd gear.
In D3, it uses 1st, 2nd, and 3rd.
In D, it uses 1st, 2nd, 3rd, and 4th.

 
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well having it in D or D3 when flooring it makes no difference unless you have a lot more power over stock and are gonna shift from 3rd gear to 4th gear.... but usually thats not the case...

D3 is used for like city driving where you dont want the transmission to shift into 4th gear. since 4th gear+lockup torque converter is used for highway crusing, it would be ideal to keep the car at top gear being 3rd gear since the revs would be higher and the car would respond better. leaving it in D during city driving, the transmission would have to shift from 4th to 3rd if you need an extra jump, but if you leave it in D3 itll just stay in 3rd without shifting in and out of 4th.

 
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when i first got my car i was using d3 like a dumbass to reach higher rpms in 3rd gear. shortly after, i read the book with the car (and eventually signed up to this site) and figured out that if i just press even harder in normal D, while in 3rd gear I can keep it in 3rd and depress when i want it to shift. it's almost like driving a stick again if i keep track of what gear i'm in. no downshifting though.

 
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Better yet, keep it in D2! hahaha

My friend does that on his car............ but only in the snow

 
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lol

i put it in d3 then throw it in 2 after ist. redline it then to 3. never touch fourth in the races unless slowing.

 
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Now that, boys and girls, is how to destroy your automatic transmissions aside from neutral drops.

 
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^^ yyeppp!!!

its an auto, so let it do its work. keep this in mind tho: D3, city driving, D4, everything else above, lets say... umm... 40MPH. causee then the revs in auto 3rd gear would be like 2500 rpm, so since you are most likely crusing above 40mph (not stop and go), go D4.

think of D4 (and torque converter lockup) as overdrive and D3 as regular drive (if anyone is familiar with Toyota auto trannies). Toyota has PRND2L, where D is basically D3 and theres is an overdrive button for 4th gear overdrive.

 
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2 and 1 isnt for racing. it just stops/slows the car down. i put my car in 2 on my driveway and it COMPLETELY stopped (engine brake), it didnt move an inch. i think that its at a disadvantage to use 2 n 1.

 
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actually your incorrect here... in 2, the car will shift between 1st and 2nd. the Gear you put it in only tells the transmission whats the Highest gear its allowed to use.

Try it, Put it in 2, and drive nomally... You'll find that the car shifts once. 1st-2nd.

 
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offtopic: I had a question. My car randomly jumps up in rpms going from 2-3? or 3-4th gear. Does anyone know what the prob would be? Is it my tranny? I just installed the kamikaze header and I started feeling it after that.

THANKS and sorry bout throwin in an offtopic ?

 
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i've never felt it shift before when i put it in 2. usually when it shifts, the rpms drop right? but when i put it in 2 it just keeps going up. maybe youre talking about the 2 when its like P,R,N,D,2,L?

 
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Come to a complete stop. when you start again, the car will be in 1st, and then shift to 2nd. once the car is in 2nd, it will want to stay in 2nd unless you come to a stop.

 
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hm. interesting. was messin with that "2" this morning. at first it felt like it was coming slower after a complete stop when i accelerated (i was thinking because it was starting in a larger gear, just like my old standard). but, now that i think about it, it was still hitting 3k (which is what i try to shift at for gas-conservation) in about the same amount of time. i'll actually have to pay attention tonight on the way home and see if it's going faster or not. i'm pretty sure now that i think about it, when i was hittin the pedal and left off at 3k it shifted (to 2nd i assume). guess just stick with keeping it in D for now, my city streets are too long for D3 to actually save me gas.

 
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D3 kills gas for me.
For all those auto racers out there.
D3 is the fastest way to get above 100mph.

 
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i started from a complete stop. it was always in 2nd i didnt feel it shift or anything. i was also watching the tach.

 
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when you put it in 2, it stays in 2. it never shifts between 1st and 2nd.

 
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yeah when leaving it in "2," there is no shift between 1st and 2nd gear when acceleratiing from a stop. the reason why the revs jump to 2000 or 3000 is becaues of the torque converter. although the transmissiomn is locked in 2nd gear, the slipping in the torque conveter allows the motor to rotate faster than the transmission is. once the car is moving fast enough, theres is less and less slippage in the torque converter. think of it as a really long 1st gear.

"2" was built in for starts in snow. if you start in 1st gear (auto), the short 1st gear ratio mulitplies the torque (or osmething), kinda like you having a lot of torque/ability to start from a stop in the lowest gear of a bike.

i wonder if htis made sense... haha

 
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so i'm wondering, how would using 2 to start from affect your engine? more gas usage? harm to the tranny?

 
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hm.. starting in 2 in auto actually doesn't harm your tranny. just think of it as you start a stick shift car on 2nd gear instead of 1st gear.
and i don't think u can choose 1st in an auto.. the lowest u can go is 2nd, which is just 2nd gear and it doesn't go from or to 1st if u use it.

 
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If I ever did that, the clutch would be gone! I personally dont see an advantage to starting in 2nd, unless I was that lazy to shift from 1st to 2nd... or my 1st gear wouldnt engage.
I was thinking what zzyzx was thinking, in D2, it would be 1st gear then 2nd and thats it... but I guess thats not the case. If you guys put it in D2 from a start, and it starts in 2nd, isnt the acceleration even slower??

 
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^^^ yes it is. very very slow.

 
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freakin ey no help again

 
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you gota give some more detail man. you have a/t or m/t? what rpm do you shift at and what gear is it?

 
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i wish my auto actually worked liked yours it would be benificial for my truck to be able to just start in second gear, stupid thing has so much damn torque its almost impossible to drive in the ran but mine does the 1 shift 2 hold until i move it

o and i always turn overdrive off when racing it prevents the torque converter from accidently locking up on you (which really sucks) also in my truck it holds the gears differently the power feels more direct and instant with overdrive off(i have a button to turn it off)

 
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AT. its around 40mph on normal throttle.

 
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Does it shift erratically? The service manual says erratic shifts could be caused by defective shift valves or shift solenoids. Is the MIL on, do u get any DTC's?

 
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is it really noticable?? like 200 rpm or more like 1000 rpm? hmm i doubt its the header. most likely defective tranny. def check it out at the dealer. if you still have warranty, they replace free of charge.

 
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well its about 600-700rpm jump. I don't think i'm under warranty because of the mods.

 
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Revving between shifts is slippage. It's only a matter of time now, but the tranny will break. I doubt any mods could have caused it, unless you have turbo.

 
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im pretty sure if you haven't modded the tranny, its still covered. its def defective. give it a shot and go to the dealer.