What gears to put in my 1995 Mustang GT automatic? - Ford Mustang Forums
 
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post #1 of 12 (permalink) Old 05-21-2007 Thread Starter
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What gears to put in my 1995 Mustang GT automatic?

Hello, I just got a basicly stock 1995 mustang GT 5.0 auto convertible with 90k. It just going to be a cruiser but I would like to be able to jump it from a stop & lite it up. Its a cali car so its got all the emissions BS it can have. I'm going to get a CIA system, remove the air pump, & clean out the cats to go with the flowmasters. Should I go would 3.73s or 4.10's? I just got 22mpg on the highway on the way home with it. I would like to keep it on the + side of 20. What kind of RPM's will I be turning at 70mph with each? Any other cheaper mods without getting into heads? Thanks
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post #2 of 12 (permalink) Old 05-21-2007
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http://www.levelten.com/pdf/mmff_02_99_chip.pdf

Read that before you consider 3.73 or shorter (numerically higher) gears with a stock AODE. Expect fuel mileage to decrease on the 'highway' but increase in the 'city'.

How are you going to get your vehicle through CA emissions inspection with no Thermactor air pump and (I'm assuming?) hollowed-out catalytic converters?

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post #3 of 12 (permalink) Old 05-21-2007 Thread Starter
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I dont plan on getting it to pass CA emissions, I'm in missouri .

Thanks for the link. After reading that article 3.55's would be better unless I want to spend around another $400.
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post #4 of 12 (permalink) Old 05-21-2007
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I have the 3.73 r&p on my Stang and I think it's the optimum gearing on an AODE GT. At 70mph in overdrive, the engine turns at 2300rpm (30.6mph/1000rpm).
I know some guys have installed a 4.10 but that makes the intermediate gearing much too short and the tranny would shift into overdrive before the 1/4 mile trap.


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post #5 of 12 (permalink) Old 05-22-2007
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found this hope its useful http://www.alternativeauto.com/techt...ips_50.html#q1

Now, if your pony car has the 4 speed AOD it's a whole different ball game. The AOD is not the most responsive transmission Ford has ever made and it needs all the help it can get. For the AOD, 3.55's are simply not enough. 3.73's are a good choice for automatic cars and again, they don't hurt gas mileage very much and the car remains as streetable as it was from the factory, only it accelerates much better. 4.10's are also a good choice for automatic cars, and we prefer them. A 4.10 may sound extremely steep, but because the AOD's 1st gear is so high (numerically low) and 4th gear (overdrive) is steeper than the T-5 it's a very good choice for the driver interested in making their car perform better.
As for the 4.10 in a stick car, we really don't recommend them for stock engines, but if you've had other work done like an intake and heads they're an excellent choice. At 60 mph in 5th gear 4.10's will bring cruising rpm up to 2204. 2204 rpm still isn't bad on the expressway but in the city you'll be doing a lot of shifting, but if that's not a problem, 4.10's offer a hellatious launch and rate of acceleration.

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post #6 of 12 (permalink) Old 05-22-2007
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Quote:
Originally Posted by FoxChassis View Post
http://www.levelten.com/pdf/mmff_02_99_chip.pdf

Read that before you consider 3.73 or shorter (numerically higher) gears with a stock AODE. Expect fuel mileage to decrease on the 'highway' but increase in the 'city'.

How are you going to get your vehicle through CA emissions inspection with no Thermactor air pump and (I'm assuming?) hollowed-out catalytic converters?
And where can u get that Level 10 PTSE chip ???

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post #7 of 12 (permalink) Old 05-23-2007
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I'd say at least 4.10's with an auto..

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post #8 of 12 (permalink) Old 05-28-2007
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Put 3.73's in the '94 GT auto over winter and have only used it on the track (road course) so far. The 3.73's are OK, I would not go to 4.10's. The one thing that made a HUGE improvement was installing a B&M Transpak last summer. That made the biggest positive difference in performance. On the street the shifts are quick and firm, on the track they are great. When we have it "race prepped", on track when you manually shift from 1-2 it will squeal the rear tires. We also found that on track do not downshift into second over 60 MPH. I recommend the transpak to anyone with an auto. I also use a trans cooler on any and all auto trannies.
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post #9 of 12 (permalink) Old 05-28-2007
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Hi, how does ur AODE stang shift with the 3.73 gears, does it hit the rev limiter and shift properly, I would like too put 3.73 gears in my 1995 GT, but I was told the tranny wouldn't shift properly without a chip. Thanks
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With the price of gas ($3.42) and the MPG of the GT (15), the GT (wifes daily driver) is sitting in the shed. She instead has stayed with driving her winter beater, an '88 4 cyl Mustang hatchback (30+MPG). So, I am not sure how the gears have changed the shift points. On track we manually shift, or when we hit the straights after coming out of a corner we will just pop it into third and let the computer do the upshift. We have the throttle floored, and I am not really watching the tach. Wish I could be more helpful with the on-street performance, but either talk to the oil companies, or my employer.
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Quote:
Originally Posted by musclemustang View Post
Hi, how does ur AODE stang shift with the 3.73 gears, does it hit the rev limiter and shift properly, I would like too put 3.73 gears in my 1995 GT, but I was told the tranny wouldn't shift properly without a chip. Thanks
My tranny doesn't have any problem shifting. The shift points are at 5300rpm for 1st/2nd and 2nd/3rd, and 5100rpm for 3rd to overdrive.
You won't need a chip.


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373's in auto 95 GT

I got 3:73's in my 95 gt Auto. Shifts fine. no chip. shifts feel a little better even.
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