will 4.10's rev to fast in a auto?

[dbrufus1234]

i want to get some 4.10 gears in my automatic, but some people say that 4.10 is too much for an auto and to go with 3.73, but im scared if i go with 3.73's that i want be able to tell much of a difference from stock, does anyone have a video of an auto with 4.10 and the camera on the tach??

also 4.10's will run at a higher rpm at highway speeds and my question is that with the rpms up higher at highways speeds will the higher gears cause engine braking or will it just coast like it does when it is stock, because that would probably drive me crazy

 

[claytucc3]

It will rev quicker......I had 4.10's in my 2001 and it was a 5 spd. I actualy changed them out to 3.73 due to the fact that I used the car as my everyday driver and wanted the top end speed still.

 

[Bullitt2343]

i want to get some 4.10 gears in my automatic, but some people say that 4.10 is too much for an auto and to go with 3.73, but im scared if i go with 3.73's that i want be able to tell much of a difference from stock, does anyone have a video of an auto with 4.10 and the camera on the tach??

also 4.10's will run at a higher rpm at highway speeds and my question is that with the rpms up higher at highways speeds will the higher gears cause engine braking or will it just coast like it does when it is stock, because that would probably drive me crazy

Yes you will notice a difference with 3.73's, I would only go with 4.10's if you plan on drag racing weekly and cruising below 70 mph most of the time. The old school 5.0 auto formula doesn't apply to the new 5 speed Autos. With 3.73's you'll have plenty to run into the low 13's maybe 12's, cruise above 75mph @ 2600rpm, and still maintaining 23mpg's.

 

[kooldawg6]

Go for the 4.10s! It makes an excellent DD in the new autos. It tachs at 3000 RPM at 80 MPH in 5th. It will tach 2500 RPM at 68ish MPH. The engine braking is not noticeable if you have it in D or OD. In "3" it will tach around 4000 RPM at 45-50, then it has some engine braking. The exhaust will crackle and pop as you slow that way...ARGH ARGH ARGH! I can easily get 22 MPG if I cruise at a steady 70 MPH or below on the highway. With mixed driving, I avg no worse than 18 MPG. Not bad for what I'm guessing to be around 350 HP @ the crank.

I was out a few months ago recording various speeds and the RPMs in D and OD. I will post those later today. They are in a notepad in the car.

 

[DennisT]

What about a daily driver w/manual which sees mostly highway miles, would the 4.10's be too steep? I do plan on eventually getting some 1/4 mile runs when I get the supercharger but I still want the car to be very streetable.

 

[05wolfkiller]

i wouldnt go with 410s if you plan on getting a supercharger. just my opinion.

 

[StonePony]

3.73 is best all-around gear for automatics in S197.

 

[sacrstang]

i want to get some 4.10 gears in my automatic, but some people say that 4.10 is too much for an auto and to go with 3.73, but im scared if i go with 3.73's that i want be able to tell much of a difference from stock, does anyone have a video of an auto with 4.10 and the camera on the tach??

also 4.10's will run at a higher rpm at highway speeds and my question is that with the rpms up higher at highways speeds will the higher gears cause engine braking or will it just coast like it does when it is stock, because that would probably drive me crazy

I guess it depends on who you ask about the gears. 4.10 guys will tell you 4.10, 3.73 will tell tell you 3.73.
I've had the 4.10 gears on my auto 05 for a little over a year. It was quite a noticable difference from a 3.31 . With the 4.10s the car takes off like a rocket and at freeway speed (3000-4000rpm) the sound of the car rivals that of the FR500 race car, I did lose top end speed BUT 80-110mph is comfy enough for me. As for the engine braking I really don't notice it.
The only close reference I have for the 3.73 is the GTH (3.55 gears) I rented from Hertz last year it could not touch the 4.10s as far as launching. It felt somewhat similiar to my 05 before it had the 4.10s.

 

[Joe Fan]

i wouldnt go with 410s if you plan on getting a supercharger. just my opinion.

+1

If you Supercharge it, go with 3.73s. I am going with 3.73s in the future but my car is a daily driver. I will never add a Supercharger because I kind of despise them because forced-air induction is the only way the Japanese can build a fast car. Non-aspirated all the way baby!

 

[claytucc3]

I concur on the 3.73's with a blower.......unless you are driving around the street w/ slicks 4.10's will be too low.....lol......


I have had both in my 01 and for the street I still pref the 3.73 the track w/ my M/T ET Streets......the 4.10's It is realy up to which is more important to you.....but if you are seriously thinking about a blower then I would def stick with the 3.73's

 

[scottfree]

+1

If you Supercharge it, go with 3.73s. I am going with 3.73s in the future but my car is a daily driver. I will never add a Supercharger because I kind of despise them because forced-air induction is the only way the Japanese can build a fast car. Non-aspirated all the way baby!

The nissan 350z is naturally aspirated and will give the gt a good run. I'm all stock right now but I dont think I would go lower than 3.73 I like to bury the speedo needle.

 

[TGJ]

I have a 96 TBird with a 4 Spd auto. It was originally equipped with 3.27's, I tried 3.55's, 3.73's and 4.30's in it. I currently run 4.30's in that car and they work very well with it. I have driven 05+ GT Auto's and from what I have learned from it and my TBird, this is what I would recommend.

3.73's for a Positive Displaced SC like Kenne Bell.

4.10's for Centrifugal SC like ProCharger or a Turbo.

4.10's - 4.30's for a N/A car. Trust me, it is not lots for these cars. My 96 TBird with a 300 RWHP+ N/A 2V that sees only a max of 6500 RPM is getting about 26 MPG on the Highway @ 70 MPH, and the car gets damn near 20 MPG in the city. My TBird is about the same weight as an 05 GT Auto.

 

[xtweakerx]

im still kicking around going 4.10's or 4.30's.

I drive it daily but not far at all. its a 5spd and i plan to always remain N/A.

I have a set of drag radials they are taller than stock.

If i had 4.30's w/ the set of drag radials on that I have for the track it would drop the gear down to 4.10..

w/ the 4.10 and radials it will prob be 3.90's-4.0's..

hmm decisions.. right now im leaning towards 4.30's, i hear they are not far off from 4.10's in the way it drives on the highway.. from what i hear dont fear the gear in these new stangs.

 

[bigcat]

im still kicking around going 4.10's or 4.30's.

I drive it daily but not far at all. its a 5spd and i plan to always remain N/A.

I have a set of drag radials they are taller than stock.

If i had 4.30's w/ the set of drag radials on that I have for the track it would drop the gear down to 4.10..

w/ the 4.10 and radials it will prob be 3.90's-4.0's..

hmm decisions.. right now im leaning towards 4.30's, i hear they are not far off from 4.10's in the way it drives on the highway.. from what i hear dont fear the gear in these new stangs.

yep, a buddy of mine just got the 4.10s. he was worried about hwy driving with the gears. he said if he could do it again, he would have got the 4.30s because the 4.10s are not nearly as bad as he expected.

4.30s ftw!

 

[kooldawg6]

Here is a short run down of my obsereved RPMs/MPH in both 4th and O/D
4.10s running OEM 235/50-18 tire

4th
3250/65
3600/70
4000/77
5000/98
5400/104(what I crossed the line at the track)

O/D
2500/70
3250/88
3600/97
4000/108
4500/122

I ran out of safe operating room to go any faster to see what max speed was in either gear, buut I can say 4.10s in an auto are VERY streetable as a DD!

 

[speed1972]

What about with a 100 shot of nitrous? What does everyone run with that 4.10's or 3.73?s I've been debating this swap since the day I bought the car but I am still undecided. I plan on a small shot of N2O for those track and back street moments but nothing else. Case in point, left a light this morning and a newer caddy would have smoked me the way he took out of there.....good thing I let out of the throttle cuz he pulled on me after about 60'.

LB

 

[Five Oh Brian]

I have 4.10's in my '07 GT Coupe Automatic. Only other mod is tuning with a Diablosport Predator tuner. Car runs consistent 13.40's at 102.5+ on the factory tires in the 1/4 mile (Pacific Raceways near Seattle).

DO NOT FEAR THE GEAR! 4.10's are great for a daily driver. With our generous overdrive (.71), 60mph is only 2,100 rpm's and 80mph is only 2,800 rpm's with the OEM tires. My fuel economy only dropped 1 mpg, but the driving satisfaction (on the street and track) is vastly improved!

I'm a gear junky. Had 4.30's in my '03 Mach 1, 4.10's in my '93 T-Bird 5.0L LX, 3.90's in my '68 Pontiac GTO, 3.73's in my '89 Mustang 5.0L LX, etc.

For those with blowers, turbo's, or nitrous, you won't need as much gear (3.55 or 3.73). But, for naturally aspirated, steep gears are the way to go.

 

[dbrufus1234]

well i think i am gonna go with the 4.10's whenever i get some money, thanks for all the input

 

[Rock36]

well i think i am gonna go with the 4.10's whenever i get some money, thanks for all the input

Awesome, but I will share my perspective.

I have a maunal, and I upgraded to only 3.73s because I feared the gear.....turns out 3.73s were just not enough and I went in and had 4.10s done.

I could not be happier!

Furthermore I am in the Army and have since been stationed in the Germany, land of the autobahns. I am regularly at or above 100 mph and the 4.10s are still not too much.

I have no regrets in anyway. The only way I will back off is if I get a supercharger, and even then I will test it with the 4.10s and make a decision after that. There are many people that run twin screw blowers with 4.10s.

The basic reason is that both the manuals and autos have a pretty damn tall overdrive, and the S197s run tall tires too. That really cuts the edge off the 4.10s.

Comparing 4.10s on an S197 isn't the same as comparing 4.10s on an SN95

 

[Five Oh Brian]

Rock36 is right about the S197 to SN95 comparison. My '03 Mach 1 could get away with 4.30's, while my '07 GT got 4.10's for two reasons....

1. Overdrive in the Mach 1 was .62 (manual trans, and very super generous overdrive that accomodates more gear), while most other SN95 overdrives were .68. The S197 Manual is .68, as well, but the S197 Automatic is .71 (not nearly as much overdrive as my Mach 1).

2. Tire height on my '03 Mach 1 (245/45/17 and 274/40/17) was not much over 26 inches tall, while the OEM tires on my '07 GT (235/50/18) are over 27" tall.

So, not as much overdrive, but taller tire.

More importantly, before I choose gears for a car, I do the math to calculate enough mph for the end of the 1/4 mile for the gear I want to cross the line in (typically 4th for it's 1:1 ratio). My '03 Mach 1 could do 124 mph in 4th gear at redline (6,800 rpm's) with the 4.30 gears. My '07 GT can do 119 mph in 4th gear (drive) at redline (6,000 rpm's). That's a little built in cushion should I ever supercharge the car and need more trap speed.

Also, as my cars are daily drivers, I also do the math to be sure I can live with the rpm's at freeway speeds. My rule-of-thumb is that 80 mph has to be below 3,000 rpm's (thank goodness for modern overdrives). Learned this the hard way with my 1968 Pontiac GTO with 3.90 gears (no overdrive, of course) that turned 4,000 rpm's at 70 mph or 4,600 rpm's at 80 mph (redline was 5,100 rpm's, but set with an MSD ignition at 5,500 rpm's for race day). I ended up dropping down to 3.55 gears in that car.