[1TITAN]

i want to know why they say you should not use o/d while racing?
why is it bad to shift these transmission into 4th under wide open throttle?
is there a way to strengthen them to where i can use 4th (overdrive) for racing?
(reason being is i am going to be getting back into autcrossing and road course racing and being minus a 4th gear could put damper on my straight away performance if ya know what i mean)

any advise yall have would be musch apprieciated

[casper gt]

biggest problem is the o/d band & torque converter clutch (not to mention the o/d gear ratio). should find lot's of info here Click Click Racing Forums - Powered by vBulletin

[1TITAN]

ehh i have to register with the site to view that link. thanks anyways

[casper gt]

Originally Posted by 1TITAN ehh i have to register with the site to view that link. thanks anyways

what's wrong with registering for a web site that'll sort out your trans problem's?

[Silverfoxbody]

The only thing holding OD is a 2" band and the smallest direct clutches. The OD shift also drives half the heavy internals in the opposite direction in a split second - it just is not designed to hold the power like this.
You can obviously modify it to use OD at your command, but I don;t condone it with any power so to say.

[1TITAN]

ohhhh i see,.... yeah ive already blown an overdrive before.

so then does it sound like i should go with a standard aod instead?

if so then does any one know what all intales swaping an aod in place of the 4r70w?

how sturdy are the aod transmissions by comparison?

[1TITAN]

ive got some concerns after doing a bit of research into the aod... from what i understand ( please correct me if im wrong) the aod is in many ways the same as an aode except for the fact that its not electronically controlled, does this mean that it has the same flaw in the 4th gear as an aode does?... if so then does any one have a better suggestion.

[casper gt]

an aod is far inferior to a 4r70w (ie. weaker) plus it wouln't bolt up to your motor (they never made an aod with a mod motor bellhousing). my sugestion is to set the car up to do what you need with 3 gears, using the extremely broad rpm/powerband capabilities of the 4.6 (built right they can be spun to ridiculusly high rpm's)

[FX4DTUF]

i think they make bell housings for c4's and c6's for 4.6's i cant remember where i seen them at but ill search

[silverstang]

Why not go with a 6 spd? Don't tell me you can't shift one yourself. If your autocrossing ALOT you would have to be semi-retarded not to consider one. 99% of real road racers run a manual anyways. You won't be putting up with ANY of this auto BS either. Now if this was a drag car, I would say stay with the auto. In your case you NEED a 6 spd.........Lots of options too. TR6060 is a good one to think about.

[casper gt]

Originally Posted by silverstang Why not go with a 6 spd? Don't tell me you can't shift one yourself. If your autocrossing ALOT you would have to be semi-retarded not to consider one. 99% of real road racers run a manual anyways. You won't be putting up with ANY of this auto BS either. Now if this was a drag car, I would say stay with the auto. In your case you NEED a 6 spd.........Lots of options too. TR6060 is a good one to think about.

+100000000000 but the o/p has stated many time's in previous post's the he want's to stick with an auto for his need's . I hate to tell anyone to take an auto out but in this case it might be the best bet.

[ReverendDexter]

Honestly, for autocrossing and road racing, the only reasons I can see to stick with a manual over a built automatic are weight and slightly less drivetrain loss.

On the courses I'm on, I don't even shift... just jam it in 2nd and leave it there. Of course, having 6800 rpm to play with and 3.27s makes that easier.

[casper gt]

Originally Posted by ReverendDexter Honestly, for autocrossing and road racing, the only reasons I can see to stick with a manual over a built automatic are weight and slightly less drivetrain loss. On the courses I'm on, I don't even shift... just jam it in 2nd and leave it there. Of course, having 6800 rpm to play with and 3.27s makes that easier.

I though the same a few thread's ago by the o/p, but he's talking about open coursetype road racing (ie. sears point/etc) not closed course. while being a drag racer I don't pretend to know much about road racing stuff, but for what he want's I can't really say an auto is gonna work or be easy to sort out.

[silverstang]

an auto is NOT the best option for his type of racing, period. You want the car in the gear YOU want it in. Sometimes an auto doesn't "think" like you do, leaving you in either too low of a gear or too high of a gear..........(you know the feeling when you WANT the car to downshift but it wont?) ALSO with a nice 6 spd you have a WIDE array of different ratios at your fingertips, not so much with the 3 usuable gears with most automatics. I'm not being a dick, just stating the obvious.

[ReverendDexter]

Originally Posted by silverstang an auto is NOT the best option for his type of racing, period. You want the car in the gear YOU want it in. Sometimes an auto doesn't "think" like you do, leaving you in either too low of a gear or too high of a gear..........(you know the feeling when you WANT the car to downshift but it wont?) ALSO with a nice 6 spd you have a WIDE array of different ratios at your fingertips, not so much with the 3 usuable gears with most automatics. I'm not being a dick, just stating the obvious.

Okay, so if you had a 6-speed auto with a manual valvebody that would address both of the issues you bring up. The automatic in the 370Z is a 7-speed with a manual-shift mode (using paddle shifters), so it's not like these systems don't exist.

[silverstang]

yeah that would work..............but find me a trans like that to bolt up behind these cars LOL............and I STILL wouldnt want to mess with an auto with a MVB....My friend has one in his 02 GT..........pain in the ass if you ask me, more work than driving a stick car LOL...........flippin switches for the convertor, etc....

[1TITAN]

yeah i hear yall ive been toying with the six speed idea as of this post, but just hearing some people hating on my automatic and then bitchin about it later just helps me get up in the morning lmao.... i just dont understand the whole elctronics aspect of it all (especially that weak ass over drive)... and yeah i manually shift the car so its not like im at a disadvantage in the turns...........

sigh im just sourcin ideas, in which case yall have been extremely helpful and i appreciate it alot

[330CubeGt]

Like Casper said i dont want to be the one to tell you to take the auto out but it might be in your best interest to go 5/6 speed.

[1TITAN]

yep thats what its sounding like..... i was lookin at all the performance rebuilds for the auto a while back and i think its funny as hell that they have a kevlar replacment band for over drive lol

you mean to tell me that the replacement overdrive band can take a bullet but it cant be used for racing lol

[330CubeGt]

Originally Posted by 1TITAN yep thats what its sounding like..... i was lookin at all the performance rebuilds for the auto a while back and i think its funny as hell that they have a kevlar replacment band for over drive lol you mean to tell me that the replacement overdrive band can take a bullet but it cant be used for racing lol

No it can be i have seen people do it,Its just not the Ideal thing to do.You want to be at the top of 3rd going through the traps

They got some carbon fiber parts to.

LoL For about $600 ish in parts and me doing the labor i could have a auto that could handle almost anything i could throw at it,thats why i went auto.