Re: Gears - to answer the questions once and for all
 

well i understand that the lower gears help accelaration but do you think the time saved by not shifting as much would make up enough to at least keep the mid 13? seams like shifting at 70-73mph n traping 76 is killing my time.


does this make since to anyone or am i just crazy?

Re: Gears - to answer the questions once and for all
 

No. 4.10's or better yet 4.30's and a good tire and hello mid 12's.

Re: Gears - to answer the questions once and for all
 

a full second out of just going 4.30? ****! ok ill try it.

thanks

Re: Gears - to answer the questions once and for all
 

fact of the mater is guys, why not? i mean everyone has done 4.10/4.30/4.56. my first thought was to go with 4.56 im just sayin if you run a taller gear na/nos/boost y wouldnt you want to less gears. i might be a lil old skool but the 2 speed glide made me lotsa cash on the street with my trucks. just saying im wrong n low gears r right is not enough for me. i see your posted times n your mods, n for the most part you guys r dam good. respect to all you guys!!!

Re: Gears - to answer the questions once and for all
 

Blown you want 3.73 or 3.89. Drag race you want 4.10 or 4.56.


Mach on,


LS:claus:

Re: Gears - to answer the questions once and for all
 

And a good tire.:3amin:

Re: Gears - to answer the questions once and for all
 

So you want to go through the traps (on an eighth mile track) in second gear?

If you only need 3 more mph (76 as stated above) than the easiest thing to do would be to raise your rev limiter 300 RPM with the 3.55 gear. If you were absolutely determined to drop gears, you wouldnt need to go all the way down to a 3.08, a 3.42 would do it.

The reason I would not go to the expense of dropping a gear is because the 3.55's are marginal for getting the car launched. Even the 3.42 would make it worse, the 3.08 would be rediculous. Not to mention a quarter mile track would just be embarrasing. A modular is not a 5.0.

The majority of the quarter mile improvement from gears is a result of a better launch and 60'. If you went with some 4.56's your holeshot would be killer and you would run through the traps near the top of 3rd gear. You'd wonder why you didnt do it sooner.

Re: Gears - to answer the questions once and for all
 

yea that was the idea to finish 1/8th n second, but i have since made up my mind that ill go 4.30. was just thinkin taller might be cool specialy out on the highway, if it didnt kill the strip times. being able to run 4th out farther than anyone would expect, but would it render 5th useless. im wondering now would 3.08 be too much for highway use in 5th cruzing 70, is it turning too slow at 1100rpm for a extended time?

Re: Gears - to answer the questions once and for all
 

The vehicle doesnt have enough power run 4th out with a 3.08, and 5th would be un-useable. Again, not enough power/torque.

Re: Gears - to answer the questions once and for all
 

Keep in mind, gears KILL your top end. If you got next to someone with the same mods or even a tad bit more(ex a ported intake) they may get a slight jump pending what rpm you start at and even if that happens its just like fishing...reel em in. They'll keep shifting, your keep pulling.

Re: Gears - to answer the questions once and for all
 

would changing my gears to 3.73's be worth it?? i have a spare set in my basement just sitting there

Re: Gears - to answer the questions once and for all
 

After reading through still a little confused with the mixed opinions...My car is a daily driver, plan on getting my exhaust done this summer and other that the RAI I have no other bolt ons.... My question is which gears would be most benificial for someone who drives thier car everyday... Do not want to lower the fuel mileage to much....

Re: Gears - to answer the questions once and for all
 

Is that with the converter locked? I think with the car floored the converter will be unlocked causing a lot more rpm and less speed. Anybody have the nuts to test this at top speed?

Re: Gears - to answer the questions once and for all
 

i love my 4.56 gears. and my cars my daily driver and it does me just fine. 5th gear really doesnt do much except keep the noise down while cruising around. and WOT in 1-4 gears is definitely a kick in the a**

Re: Gears - to answer the questions once and for all
 

4.30s for a stock 3650. That is what I have in mine and it is a daily driver. Even back and forth to Vegas (300 miles each way) many times.

Jerome

Re: Gears - to answer the questions once and for all
 

man idk what gears i want to get for my 03 mach, 373s or 410s, im gana use my mach for cruises, autocrossing, and goin out on the weekends but idk wat gears i should go with, sum1 wana help me out?.

Re: Gears - to answer the questions once and for all
 

that might help with street racing have stock gears but not in a quarter mile.... someone that can shift with 4.56s or 4.30s is gonna burn ya at the the track

Re: Gears - to answer the questions once and for all
 

4:10's for mine. Love the gears...

Had the gearset from my old car, would go to 4:30's if I had to have bought them new...

Re: Gears - to answer the questions once and for all
 

Re: WOT in a 4R70W. I thought I might try the Movaje Mile or the Texas mile with my auto Mach 1 but the speed shop said NO! They claimed the trans won't hold up under WOT. It thought I'd go straight to the source to I emailed a close friend who works at Roush but is retired from Ford Driveline. This is his response with names and numbers deleted. This only concerns WOT and not a 3-4 shift at WOT. Start at the bottom.


XXXXXXXXXX
Powertrain Engineering
Roush Industries
313-XXX-XXXX

Yep,
4R70 and 4R75 are mechanically identical but some components are of higher torque capacity.
Tell your friend to enjoy his drive
XX


On Tue, Aug 23, 2011 at 2:14 PM, XXXXXXXXX

XXX, thanks for the info. Assuming that 4R75=4R70 for this discussion. I'm just not as familiar with the badging.
Regards,

XXXXXXXX
Powertrain Engineering
Roush Industries
313-XXX-XXXX


Hi XXXXX,
the "never" drive at WOT in OD is a carryover concern from "WAY BACK WHEN" at the beginning when 4R75 was called AOD, and it had a lube issue for the gear set - that was corrected and doubly verified to be cured (multiple times) each time a new manager showed up and had heard the same concern. When XXXX XXXX was the manager, XXXX XXXXX was also concerned and they convinced themselves (and the rest of Ford ATEO) that there was indeed NO issue with running at high speed in 4th gear.
Just do NOT downshift to 2nd gear at high speed from 4th - this manuver will indeed cause major damage (this was a calibration error by a hard-headed calibrator who insisted on not allowing a downshift at high speed, despite the fact that the OWC would self destruct) - no I won't tell you who he was, but I'll bet you do know him.
BOTTOM LINE
It's OK to drive high speed in 4th.
Take care,
XXX


On Tue, Aug 23, 2011 at 12:38 PM, XXXXXXXXXXXX

Hi XXX, enjoy receiving the snippets. I forward them on to my brother in Winchester Tn. who has a plastics business that supplies into the industry.
How is your son doing?
A friend of mine has a 2003 Mustang with a 4.6L and subject trans. He had a performance shop do some work on the trans and put in a high rpm stall convertor. He was advised (with emphasis) to NEVER drive wide open in overdrive. The shop said the overdrive was meant for expressway cruising not max speed runs.
My friend would love to see what the top end of his car would be but fears going any faster than 3rd gear allows.
Is this an issue with the 4R that your aware of from your days in trans?
Thanks.
Regards,

Re: Gears - to answer the questions once and for all
 

I am very surprised that there was no mention about the harmonic driveshaft balancing issue at high speeds with the automatic mach/police interceptor. It is/was a very well known issue! I'm sure that you already know that all 03-04 auto Mach's/Police Interceptors are electronically limited to 127MPH. As far as I know, this prevents a WOT shift into OD, and it also protects the driveshaft from breaking due to excessive RPM's and causing major damage! I disabled my 127MPH speed limiter and drove my auto Mach up to 137MPH on GPS, but I could start to hear the resonance so I backed off!!! I'm really glad that I did because I recently had a driveshaft failure in my 2011 V6 at 135MPH! It really caused a lot of damage to the car and I would have cried if that had happened to my Mach! As far as the top speed of the auto, all I can say is that it gets to 130MPH in a heartbeat (3'rd gear), but once it shifts into OD there is not much acceleration because it's like running in 5'th gear with a manual mach. (They toped out at 151 in 4'th) I know mine hit 137, and there was probably more left, but exactly how much more I don't know because I started going up hill, heard the driveshaft, then I backed off. Go to youtube and search "Mustang V6 driveshaft failure", before you run your Mach faster then 130!

Re: Gears - to answer the questions once and for all
 

Thanks for the info. This is actually the first I've heard about driveshaft problems. Way back when I was told the top speed limiter was lower in the auto due to the torque converter balooning at high rpm. I have a locking billet 4k stall conveter now.

Re: Gears - to answer the questions once and for all
 

No problem, I have heard that one too, especially on older cars.

Re: Gears - to answer the questions once and for all
 

I was wondering the same thing?

Re: Gears - to answer the questions once and for all
 

For a bolt on Mach 1, none. You'd lose "performance". From a dig alot of damage can be done with a 4.10 but on the street a 3.55 will own it.

Re: Gears - to answer the questions once and for all
 

I've tested and proven this, but this crowd will never believe it until they match up with another mach with stock gears and get pulled.