[1989Gt.]

I was wondering if there is any way to know how much i can gain in 0-60 times with the 355s... i have an aod... btw and i have 3.08s now

[sickfox]

dont bother, get 3.73's or 4.10's

[M L Struck]

I can't give you a number but if will have a better seat of the pants feel

[Traidmarx]

of of your 0-60 time you might shave .2 or maybe .3 seconds off if that. if ya going with gears 3.55 isn't really a huge step up. I mean yea you'll feel it but if you're doing a swap might as well get whats best 3.73's but i personally would say 4.10's

[Chris951]

4.10's with an AOD

[Techniq]

No idea... I could tell you what my 0-60 was. But I wouldn't even bother with the 3.55's. Go 3.73's or 4.10's like everyone else is sayin.

[EscortSportage]

or. u could go with something between 373 and 410 what about a :

3.90 i think or 3.83 i think there are some in between ratios like that,

id scrap that AOD for a T5 in a heart beat tho

[baine21225]

I have a brand new in box set of 4.10's I'm ready to sell, complete install kit and axle bearings come with it

[89Domindart]

Why is 3.55 such a horrible gear? I want some nice highway driving too, so Im thinking 3.55 is a better gear for me, I had a friend w 3.73 and it was nice but too revvy on the highway I think. Theres really not that much a difference in the 3.55 and the 3.73 ratio really...... is there?

[817B!GT3X]

For an AOD I go with a 4.10 gear ratio the AOD will benefit from it.

[baine21225]

Originally Posted by 89Domindart Why is 3.55 such a horrible gear? I want some nice highway driving too, so Im thinking 3.55 is a better gear for me, I had a friend w 3.73 and it was nice but too revvy on the highway I think. Theres really not that much a difference in the 3.55 and the 3.73 ratio really...... is there?

no, not much difference, so i'd go with a 3.73 of the two.....but for an aod i'd suggest at least a 4.10

[sickfox]

Originally Posted by 89Domindart Why is 3.55 such a horrible gear? I want some nice highway driving too, so Im thinking 3.55 is a better gear for me, I had a friend w 3.73 and it was nice but too revvy on the highway I think. Theres really not that much a difference in the 3.55 and the 3.73 ratio really...... is there?

3.73 gears are anything but revvy on the highway. and there is a diff. just not much. he can do the 4.10's and be on the highway too, as i was told "dont be afreaid of 4.10's"

[89Domindart]

hmmmmmmmmmm what to do.

[White Thunder]

aod - overdrive

get the 410s

[cusp]

Originally Posted by 89Domindart Why is 3.55 such a horrible gear? I want some nice highway driving too, so Im thinking 3.55 is a better gear for me, I had a friend w 3.73 and it was nice but too revvy on the highway I think. Theres really not that much a difference in the 3.55 and the 3.73 ratio really...... is there?

I have been pondering the same question. Gears for hopping on the freeway better and not sucking a lot more gas or suffering drone. I haven't decided yet myself. But from the gear spread sheet, I can "what if" that with my transmission, tire size, and various rear ends that.

With the stock 3.31s in 4th gear, the 6500 RPM speed is 159 Mph which I am sure the car can't do.

With 3.55s the car will hit 6500 RPM in 4th gear at 148, Mph which is what I read is about the top speed of a S197GT due to drag.

With 3.73s 6500 RPM will be at 141 Mph.

Seems to me that Ford's original choice of gears for the S197 GT maxed it out speed wise. Although with 5th gear, it doesn't matter, will never see 5th maxed out because its over 200 MPH and one would need about 700 HP to get there.

One could say that for drag racing you would leave a lot of unused gear at the end of the 1/4 mile with 3.31s or 3.55s and they would be right. With 4.10, 4th gear is right at the top of the power band at about 108 Mph and can take you to 128 Mph at red line. So for drag racing, it looks to be a great gear.

Running a 3.73, Gear for the 1/4, you may not have to use 4th at all. 3rd may hang in there but would be beyond the power band and about rev'ed out. So it begs the question, what costs more, running over the top of the power band an extra 1000 RPM in 3rd or taking another shift? A question best deferred to the drag racers. I am not one of them.

Getting back to Ford's original choice of 3.55s for their stock GT and daily driver type usage.

Hitting the freeway on ramp. With 3.55s, and shifting at 5500 RPM, 1st will take me to 37, 2nd to 63, and 3rd way over the speed limit at 95. Those speeds are expanded out some if I take it to 6500 RPM of course.

With the 3.73s and shifting at 5500 again, will see 35, 60, and 90 or if taken to the red line, 42, 70, and 107.

So the difference between 3.55s and 3.73 for hopping on the highway are only 2 to 5 Mph. Very close.

What about cruising the freeway for those 8 hour stretches. Cause 8 hours is a lot longer than 13.5 seconds down the strip.

Interstate speed limits range from 65 to 75 every where I have driven. And I know many drivers like to plus 5 to 10 a lot. So lets see.

Using 5th cause we are cruising down the highway...

with the stock 3.31s and 60 Mph, I see a lazy 1670 RPM and at 80 its only turning 2227. From experience I know that the engine is very quite there. And I am making good time to boot.

With 3.55s and 60, its only up to 1791 and by 80, 2389.

The 3.73s, and 60, is 1882 and by 80 its at 2510. A 283 RPM increase over the stock 3.31. Not awful I suppose.

I know in this car that about 2500 RPM I am hearing the engine. Its not bad yet, but its above the barely notice level.

My car at 60 MPH on level ground and calm air gets over 30 MPG as read off the info center. at 75 - 80 that drops to about 27.5 Which I think is very good and well in excess of the 23 the EPA claims.
As much as I would like that seat of the pants feeling of the 3.73s every one talks about, I wonder what those extra 300 RPMs all the time will do to my fuel requirements. If its only going to be like 1 MPG at 80 which I have heard claimed... why not. But if its going to be 4 or 5 MPG. Thats a different story. And if the 3.73 will cost X more gas, will the 3.55s cost X/2?

I read a post saying that the 3.55 get better highway mileage than the 3.31s!!! Can it be so? Is there someone who has made the gear switch and paid attention to the change in gas?


What would I hope to improve going to 3.55s from my 3.31s....
Less clutch needed when leaving a stop. A little slower idle rolling speed before needing to put the clutch in. A little better get on the freeway and hopefully a small if any increase in gas consumption especially on the highway because that were most of my miles are with this car. And no extra noise at legal speeds.

What is the cost gas wise for the gears?

[Ntv69]

Originally Posted by baine21225 I have a brand new in box set of 4.10's I'm ready to sell, complete install kit and axle bearings come with it

check pm

[superbean]

0-60? who gives a shit lol

[sickfox]

Originally Posted by cusp I have been pondering the same question. Gears for hopping on the freeway better and not sucking a lot more gas or suffering drone. I haven't decided yet myself. But from the gear spread sheet, I can "what if" that with my transmission, tire size, and various rear ends that. With the stock 3.31s in 4th gear, the 6500 RPM speed is 159 Mph which I am sure the car can't do. With 3.55s the car will hit 6500 RPM in 4th gear at 148, Mph which is what I read is about the top speed of a S197GT due to drag. With 3.73s 6500 RPM will be at 141 Mph. Seems to me that Ford's original choice of gears for the S197 GT maxed it out speed wise. Although with 5th gear, it doesn't matter, will never see 5th maxed out because its over 200 MPH and one would need about 700 HP to get there. One could say that for drag racing you would leave a lot of unused gear at the end of the 1/4 mile with 3.31s or 3.55s and they would be right. With 4.10, 4th gear is right at the top of the power band at about 108 Mph and can take you to 128 Mph at red line. So for drag racing, it looks to be a great gear. Running a 3.73, Gear for the 1/4, you may not have to use 4th at all. 3rd may hang in there but would be beyond the power band and about rev'ed out. So it begs the question, what costs more, running over the top of the power band an extra 1000 RPM in 3rd or taking another shift? A question best deferred to the drag racers. I am not one of them. Getting back to Ford's original choice of 3.55s for their stock GT and daily driver type usage. Hitting the freeway on ramp. With 3.55s, and shifting at 5500 RPM, 1st will take me to 37, 2nd to 63, and 3rd way over the speed limit at 95. Those speeds are expanded out some if I take it to 6500 RPM of course. With the 3.73s and shifting at 5500 again, will see 35, 60, and 90 or if taken to the red line, 42, 70, and 107. So the difference between 3.55s and 3.73 for hopping on the highway are only 2 to 5 Mph. Very close. What about cruising the freeway for those 8 hour stretches. Cause 8 hours is a lot longer than 13.5 seconds down the strip. Interstate speed limits range from 65 to 75 every where I have driven. And I know many drivers like to plus 5 to 10 a lot. So lets see. Using 5th cause we are cruising down the highway... with the stock 3.31s and 60 Mph, I see a lazy 1670 RPM and at 80 its only turning 2227. From experience I know that the engine is very quite there. And I am making good time to boot. With 3.55s and 60, its only up to 1791 and by 80, 2389. The 3.73s, and 60, is 1882 and by 80 its at 2510. A 283 RPM increase over the stock 3.31. Not awful I suppose. I know in this car that about 2500 RPM I am hearing the engine. Its not bad yet, but its above the barely notice level. My car at 60 MPH on level ground and calm air gets over 30 MPG as read off the info center. at 75 - 80 that drops to about 27.5 Which I think is very good and well in excess of the 23 the EPA claims. As much as I would like that seat of the pants feeling of the 3.73s every one talks about, I wonder what those extra 300 RPMs all the time will do to my fuel requirements. If its only going to be like 1 MPG at 80 which I have heard claimed... why not. But if its going to be 4 or 5 MPG. Thats a different story. And if the 3.73 will cost X more gas, will the 3.55s cost X/2? I read a post saying that the 3.55 get better highway mileage than the 3.31s!!! Can it be so? Is there someone who has made the gear switch and paid attention to the change in gas? What would I hope to improve going to 3.55s from my 3.31s.... Less clutch needed when leaving a stop. A little slower idle rolling speed before needing to put the clutch in. A little better get on the freeway and hopefully a small if any increase in gas consumption especially on the highway because that were most of my miles are with this car. And no extra noise at legal speeds. What is the cost gas wise for the gears?

if your worried about your gas mileage that much go get a 4 banger. nuff said.

[Chris951]

Originally Posted by turbofoxbody if your worried about your gas mileage that much go get a 4 banger. nuff said.

Word. I have 4.10's in my fox and it's awesome. 1st gear is useless but I don't care. When I get on the freeway sometimes I like to stomp the gas... I remember when I shifted at 5500rpms I was at probably 80 at the top of third. I cruise at 70mph on the highway at 2600rpms in 5th

[1989Gt.]

well thanks for all the info.. i have a set of 410s already got them for free ford racing from a buddy... but i kinda wanted 355s... idk ill check it out more thanks