What Gears 3.55 or 3.73 for 02' 5 speed? - Ford Mustang Forum
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post #1 of 62 (permalink) Old 01-06-2002
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What Gears 3.55 or 3.73?

I have an 02 GT 5speed, and was wondering what gear would be a good all around gear? I mean city and highway, I am not worried about economy.
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post #2 of 62 (permalink) Old 01-06-2002
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Re: What Gears 3.55 or 3.73?

3:73 are alot of fun but you might get tired of shifting alot, 3:55 are alittle tamer but both will make an noticeable change to your performance. :p Frank
post #3 of 62 (permalink) Old 01-06-2002
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Re: What Gears 3.55 or 3.73?

I have a 98 Gt w/ 5spd. and stock gears, and from what I've read about which gear to choose, Most say if you have a manual tranny, 3:55's are fine. If you have an auto, go with 3:73's. They say that w/ a manual tranny, 3:55's are plenty. Maybe we can get input from people who have had both.

Mike
98 GT
post #4 of 62 (permalink) Old 01-06-2002
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Re: What Gears 3.55 or 3.73?

I have 3.73's and a 5 speed in my car now and they are great. The last car I owned had 3.55's with a 5 speed, and I like the 3.73's better. I drive 20+ miles to work one way, use my car for work (about 700 miles per month total) and do not think it needs to be shifted too much or that it revs too high on the freeway. They are much better than the 3.08's I replaced.
post #5 of 62 (permalink) Old 01-08-2002
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Re: What Gears 3.55 or 3.73?

Hey Jarrett? I just bought my 98 GT a month ago and am pretty sure my gears are stock. Mine runs about 2100 RPM's at 70mph. I drive 38 miles one way to work, 80% highway, so gas mileage is important to me. It get's 24-25 mpg's right now, and I'm VERY pleased with that. Just out of curiosity, what RPM does yours run in 5th gear at 70mph?

Mike
1998 Mustang GT, 5 spd, 17" wheels, all stock (I think)
post #6 of 62 (permalink) Old 01-08-2002
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Re: What Gears 3.55 or 3.73?

It turns about 2200 rpm @ 60mph. That is with a 26" tall tire and the 1985/1986 T5 which has a taller O/D ratio than the newer ones. With the newer trans, if your car had a 26" tall tire I think it would spin around 1900 - 2000 rpm at 60.
post #7 of 62 (permalink) Old 01-08-2002
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Re: What Gears 3.55 or 3.73?

Jarrett,
I don't know how tall my tires are but they are 245/45/ZR17. Is that what your's are?

Mike
1998 Mustang GT, 5 spd, 17" wheels, all stock
post #8 of 62 (permalink) Old 01-09-2002
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Re: What Gears 3.55 or 3.73?

Your tire height is 25.6" In fifth at 60 it should turn 14-1500 rpm with 2.73's, and 16-1700 with 3.08's. What does it actually turn, keeping in mind that the factory tach is not accurate?
post #9 of 62 (permalink) Old 01-09-2002
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What Gears 3.55 or 3.73?

Jarrett,
Mine runs about 1800 rpm's at 60mph. Could it be that mine has 3.08's in it from the factory? At 70 mph, it runs about 2100-2200 rpm's. I've heard that some 98 GT's came with 3.08's.

Mike
1998 Mustang GT, 5 spd, 17" wheels, all stock
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Re: What Gears 3.55 or 3.73?

Check the door tag, it lists the axle code. Get the code (two digit), and I will see if I can find the code breakdown I have at home. It lists the code under the axle box on the drivers door jamb, two digit for a GT one digit for V6.
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Re: What Gears 3.55 or 3.73?

Jarrett,
The axle code is ME.

Mike
1998 Mustang GT, 5 spd, 17" wheels, all stock
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Re: What Gears 3.55 or 3.73?

Can you check that again? M is the code for 2.73, and E is the code for 3.27. It can't have both.
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What Gears 3.55 or 3.73?

Jarrett,
I checked that code again, and it does say ME. Under the AXLE section it says ME.

l AXLE l

l ME l

That's what it looks like. Where are you getting these code descriptions from?

Mike
1998 Mustang GT, 5 spd, 17" wheels, all stock
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Re: What Gears 3.55 or 3.73?

This is what I found.
"If you should want to use the gears out of another 98 Mustang, check the axle code (AX) on the door sticker. As you can see, Cobras come with the E code. These are the only ratios offered during regular production. Higher ratios are available with dealer installation or thru after market suppliers. "


CODE NO. RATIO
8(M*) 2.73:1
5(E*) 3.27:1
6(W*) 3.73:1
Y(Z*) 3.08:1
F(R*) 3.45:1
* denotes limited-slip axle
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What Gears 3.55 or 3.73?

Jarrett,
Maybe the M in my code tells me I have 2.73's and the E is for something else. I don't know, that sounds kind of weird. I guess I'll just have to go ahead and put new gears in myself, THEN I'll know for sure what's in there! hehe Thanks for the help.

Mike
1998 Mustang GT, 5 spd, 17" wheels, all stock
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