4:10's for auto? - Ford Mustang Forum
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post #1 of 16 (permalink) Old 08-08-2007 Thread Starter
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4:10's for auto?

I was just about to order when i saw someone say that 3:73's are better for automatics. They said if i were to get 4:10's then all the shifting would get really annoying. For the people who have automatics and has 4:10s, hows the shifting? I just dont want to get 3:73s and wonder if i should have got the other instead.


Sorry if this has been posted before...just looking b/c hopefully i should order really soon.


thanks

Kyle

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post #2 of 16 (permalink) Old 08-08-2007
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If I'm not mistaken, and I'm sure some S197 guys will comment, if you make a gear swap, you have to use a programmer to make the computer and speedo act right. At the same time the automatic tranny settings should be adjusted for the gears too.

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post #3 of 16 (permalink) Old 08-08-2007 Thread Starter
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yeah ihave a SCT tuner thing that i heard could change the settings.

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post #4 of 16 (permalink) Old 08-08-2007
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The simple rule of thumb is:

If you are running an N/A automatic, you can go with 4.10 although your mileage and highway top end may suffer a bit...

If you are going to supercharge, the 4.10 may be to steep unless you are going "all out drag racing" with taller tires or a 20" wheel combo...

I am supercharged and find that the 3.73 are the best all around performance gear for me...

Going from the stock 3.31 to 3.73 will yield a very nice performance gain... Going with a 4.10 will peel the skins off your tires in no time...

No matter what gear selection you make, have a qualified and experienced gear installer work on your car...

The installaton is everything and only buy FRPP gears for whine free operation...

Let us know what you finally decide on...

Best of Luck, Dave
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post #5 of 16 (permalink) Old 08-08-2007 Thread Starter
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i dont really think ill be supercharging anytime soon...im only 17 and probably if i didnt buy all the appearence and other things like tune and axle backs i might have been close. How much is the difference between the two...like sometimes i like to hear the tires screech from a dead stop...will i hear this with the 3:73s? Im spending alot so i just wanna make sure its what i really want.

thanks

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post #6 of 16 (permalink) Old 08-08-2007
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See my response to your PM...

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HP numbers are good and all, but they are like asking someone how much they can bench. What difference does it make if I can still kick your a$$?
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post #7 of 16 (permalink) Old 08-09-2007
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I have 3.73's on mine now with an auto. I liked it and felt the difference. ALothough not as much as what ppl say about 4.10's. I went 3.73's cause I wanted a slighter more pickup to the car, but not suffer too much top end speed. ones who have 4.10's will mainly tell you "whats the point in going over 130-140?" which is a true statement. but hey I have lots of highways where I live and I've had to open it up a few times. and in the long run it keeps them camaro's in my rear view mirror SO I giess its a matter of whats good for you and your area. I'm sure w/e don tells you is 100% accurate and true so his .02 are valuable.

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post #8 of 16 (permalink) Old 08-09-2007 Thread Starter
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i posted this question on another site and pretty much all the answers from them were saying 3:73's...but im sure don as alot of experience. I just heard the ride really wasnt pleasant at all b/c of all the shifting of the auto. This car is my DD so i really dont want that lol.

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post #9 of 16 (permalink) Old 08-09-2007
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if youre worried about the shifting of the auto, your programmer has the ability to change shift points and rpms, stuff like that.

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Your SCT X-Cal will take care of the speedo prob. As far as shifting, I have had no problems. It's a tad jerky when I get on it, but nothing major. Aside from the headaches from an improper install, they are pretty awesome. I could have lived without them, but if someone pulls up to you at a light, these will certainly help change their mind about the next time.

Just make sure you have a good gear guy doing the install or you will be sorry.

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Quote:
Originally Posted by bigwilly43729 View Post
As far as shifting, I have had no problems.
+1 ...


... but keep in mind my car is a looooong way from stock. Not the least of which is a 3500 stall converter.

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Quote:
Originally Posted by bigwilly43729
HP numbers are good and all, but they are like asking someone how much they can bench. What difference does it make if I can still kick your a$$?
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post #12 of 16 (permalink) Old 08-09-2007 Thread Starter
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haha thanks guys...just one more question. When doing gears does it put any strain at all on the motor or any other parts?

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Just have a guy do it that knows exactly what hes doing. and you'll be fine. and break em in smooth. theres a forum i think on how to do it.

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post #14 of 16 (permalink) Old 08-09-2007 Thread Starter
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That was one thing my parents really needed to know was if it would lower the cars life lol. Im only 17 and i allready have the need to keep going faster haha. So if i get a good install then the car will last as long as if it had the stock gears?

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As with anything, the gears have a life too. If I had to guess, I'd say that they will last just as long as the stockers would have with proper care and maintenance. I'm sure the gear fluid has to be changed every now and again. The dealer can tell you when that needs to occur.

That's good that your parents are looking out for you.

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