So does shifting from drive to neutral while like, say, going down a hill count as auto shifting and as such damage your transmission just as much as from 1-2-3-D? And i dont want a flood of people asking why i would shift into neutral, i would just like an answer please!

i shift into N all the time, good for braking in the winter because it cuts the torque from the wheels.

i havent had a problem with mine yet because of that.






Injection is nice but id rather be BLOWN!

whitegoose wrote:i shift into N all the time, good for braking in the winter because it cuts the torque from the wheels.
i havent had a problem with mine yet because of that.

I wouldn't recommend it, but it will not hurt to much, I GUESS.

I am confused why you wouldn't want the "engine brake" to help you to slow down in the winter. "Leave it in Drive."




PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

GM recommends you downshift to a lower gear while going down long hills. It is NOT recommended that you shift to neutral (ever!) because if the car stalls you're left with no power assist on the steering or brakes.

Your choice... but seeing as brakes are cheaper than transmissions (or cars), I'd suggest just leaving it in drive and using your brakes the way the car was designed

when you down shift, the gear ratio changes.

changing the gear ratio allows more torque to be applied to the wheels, more torque to the wheels when you are sliding, causes you to continue sliding usually.

i find the throwing it in neutral and cutting the torque from the wheels is what has worked best for me.






Injection is nice but id rather be BLOWN!

if shifting into neutral while driving was going to hurt your tranny, the manufactures wouldn't let you do it. its like manualy shifting. if it hurt the tranny there would only be a D. i shift manualy all the time and it doesn't hurt anything. my tranny shifts perfect. if your in 1 or 2 the computer boosts line pressure so it acts like a shift kit. if you put it in either 1 or 2 from a stop and floor it till lets say 100, it goes through all the gears and they all shift hard. thats what i do when i drag race. its better for your tranny. the clutches slip less and last longer. back to the question. i used to shift into neutral all the time going down big hills thinking i would save gas but i really didn't. that never hurt my tranny. it shifts perfect.

It doesn't increase line pressure in 1 or 2. Not on a J-body tranny, at least.

if it doesn't boost line pressure then what makes it shift hard? theres nothing else the tranny can do but raise line pressure. it can't magically change orfice sizes in the valve body and channel plate to let more fluid flow. if you don't beleive me, get in a j-body with a 4T40-E. put it in either 1 or 2 and floor it from a stop. you should feel it shift pretty firm. mine usually snaps my head back.

I owned two 4T40E's. I have the technician service manual as well.

Putting the selector in L or 2 doesn't increase line pressure. If yours is 'snapping your head back'... then guess what? You screwed up your trans by shifting it manually! (Congrats! I love it when people help me prove things)

The line pressure is increased electronically only when needed. Also with speed of trans pump.

Shifting into a lower gear would not be harmful given you are not doing something stupid.

Shifting into N at a stop light would be ok to prevent excess heat. Not really needed with a J, though.


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Yea, ummmm. I used to have a J-body...

thats kinda funny. i screwed something up. i highly doubt that. then how come when my sister had a j-body with a 4T40-E hers did the same thing as mine. there was nothing wrong with hers and theres nothing wrong with mine. in fact i just rebuilt mine about 10k ago cause the diff pin ground it self down and the pump seal went out. it shifted like that in 1 and 2 before and it does the same thing now. and one a my buddys had a 2000 malibu with the 4T40-E and his shifted hard in 1 or 2. maybe someone needs to learn how to face the fact that hes not always right. if you really want to argue about it, i'll let you talk to my college instructors. the one only ranks in the top 10 master techs nation wide for gm. then my other one worked at a tranny shop for 20 years and has rebuilt counts 4T40-Es and they both say the same thing. the computer boosts line pressure in 1 and 2. i rest my case.

Whatever you say man

Hmm, fascinating. I didnt really think my tranny would run into different gears if i didnt switch it with the shifter, ya know kinda like a manual shifter? But then again, the times ive done that, i didnt really wanna snap something so ive shifted before redline. So your telling me I can leave it in 1 on my 98 3 speed and itll go up to 108? running through 1st 2nd and 3rd? huh, get back to me on that.

i don't know about the three speeds. that i couldn't tell you. i know the 4 speeds do. i don't think the 3 speeds will cause there not electronically shifted. i really don't think they will. i'd say try it but if it doesn't shift then you risk blowing your enigne. i guess its up to you.

i never tired it si i wouldnt know



Im a Xbox 360 fanboy...and damn proud of it!!

when traveling forward in a J body 4T40E and one lets off on the gas, no torque is being applied to the wheels and the engine is only minimally powering the tranny thus shifting into neutral in winter is pointless and no offence to your top 10 master tech but i've been around on the planet long enough to know that there are alot of MASTER TECH'S who can't find their asses with 2 hands. having owned 2 4spd auto's as Jawn has, plus knowing Jawn very well, his knowledge on the subject is very correct.

tell me this. have you guys even tried putting it in 1 and letting it shift through all the gears? if the line pressure isn't boosted then what makes it shift firm. its not just my car that does it and theres nothing wrong with it. if theres something else as to why they shift firm, please tell. you guys really got me curious. if it doesn't boost line pressure like you say then whats making it shift like it does? please tell.

as far as 3 speeds go

they wont shift through any gears unless it is in D

but also u wont blow ur engine if u put it in 1 and keep driving. there IS a rev limiter and you will keep bouncing off the limiter until u shift into 2 or D

but of course manually shifting a auto isnt a good idea from what i have read.

from a stop
if it is in 1 it will go to the limiter

from a stop
if it is in 2 it will go through gear 1 and then hit the rev limit in 2

from a stop
if it is in D it will go though 1, 2, and then hit the speed limiter.







:::Creative Draft Image Manipulation Forum:::

Nathan Jorgenson wrote:tell me this. have you guys even tried putting it in 1 and letting it shift through all the gears? if the line pressure isn't boosted then what makes it shift firm. its not just my car that does it and theres nothing wrong with it. if theres something else as to why they shift firm, please tell. you guys really got me curious. if it doesn't boost line pressure like you say then whats making it shift like it does? please tell.

You talk to us like we have never driven a auto J-body. Dude, I have owned THREE so far, and I put one of them thru the quarter mile in the 13's with a stock transmission. So for the record, I KNOW WHAT I'M TALKING ABOUT. For crying out loud... I've had a 4T40E apart, I know what's inside of them. I even own the Hydra-matic service manual (with ALL the fluid flow diagrams, and yes, I know what they mean and how the fluid goes and so on..)

your transmission is FOOKED. It is NOT supposed to shift thru gears in 1st. It should ping off the rev limiter, like this guy's does: (his transmission is working properly!)

Nathaniel O'Flaherty wrote:as far as 3 speeds go

they wont shift through any gears unless it is in D

but also u wont blow ur engine if u put it in 1 and keep driving. there IS a rev limiter and you will keep bouncing off the limiter until u shift into 2 or D

but of course manually shifting a auto isnt a good idea from what i have read.

from a stop
if it is in 1 it will go to the limiter

from a stop
if it is in 2 it will go through gear 1 and then hit the rev limit in 2

from a stop
if it is in D it will go though 1, 2, and then hit the speed limiter.

The 4 speed (4T40E) is exactly the same when it comes to shifting.

Why your transmission does it, and no one else here does? You tell me. Maybe you got a magic transmission installed at the factory?

Mines a 4T40E, If I put it in first, traction control turns off and it bounces the limiter never leaving first. 2nd gear, shifts smoothly through first and into second then bounces the limiter in second.

The only time i put my car into Neutral is at a dead stop at a stop light, the reason is with my air conditioner on and my motor mounts, the cd player skips.. haha. Too many vibes.

Its not the brightest idea to shift the gears because as said millions of times before, your not going to shift it any better than the computer. The only benefit of putting it in a lower gear is the traction control turns on in the cavaliers. I believe the sunfires have the switch.

In my honest opinion your only going to cause more heat and damage your tranny.

my friend had a 4t40e and he used to do that all the time and one day it shifted so hard that it blow the drive gears through the trans. pan.


2002 cavy with 5spd ecotec(RIP)
1991 eagle talon tsi awd 5spd(sold)
1999 audi a4 1.8l turbo 5spd
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get an auto trans interceptor...i would like a manuel but since i have an auto it was the next best option..i like it...shifts so much stronger...as far as how much faster if makes ur car..i think some have said about .1-.2 in the quater mile ( i never tested it)

go for it, there like 100 buxs....and stop shifting ur auto...it will thank u in the long run!

better buy up any Interceptors you can cause the company has apparently gone bye bye!!

my car has 13k on it and its a 2005 auto sunfire i will find out tommorw but im pretty sure they will not let u tear up the engine or bounce of the limiter, when u put in in 1 or 2 it will shift. my 99 z24 shifted when put in 1,2, or 3 also.

if its in 1st, it will hit the limiter. if its in 2nd, it will rev to 6500 at WOT then shift into 2nd and go up to rev limiter. if its in 3rd...........you get the picture.