2003 GT stock rearend????

Ok. Correction. 275/40/19
a 275/40/19 is a 27 inch tall tire and if you are at 2500rpm at 70mph, you sir have 4.30s gears. Its actually 70.3. Your tires are the wrong size for a Mustang. Are they drag radials?

A 35 series 19inch is 26.5" and a 30 series is 25.5". Stock is 25.68".

Mine for reference:
3.90 gears, 275/35/r18 is a 25 inch tall tire and at 2500rpm, Im at 71.7mph
stock: 3.27 gear 245/45/r17 is a 25 inch tall tire and at 2500 rpm, its at 85.9mph.

Axle calc for your use.
https://drive.google.com/open?id=0BxRmaQKbPZklMW54QXgwRmlzOUU
 
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a 275/40/19 is a 27 inch tall tire and if you are at 2500rpm at 70mph, you sir have 4.30s gears. Its actually 70.3. Your tires are the wrong size for a Mustang. Are they drag radials?

A 35 series 19inch is 26.5" and a 30 series is 25.5". Stock is 25.68".

Mine for reference:
3.90 gears, 275/35/r18 is a 25 inch tall tire and at 2500rpm, Im at 71.7mph
stock: 3.27 gear 245/45/r17 is a 25 inch tall tire and at 2500 rpm, its at 85.9mph.

Axle calc for your use.
https://drive.google.com/open?id=0BxRmaQKbPZklMW54QXgwRmlzOUU
The tires are big fir the car. They're Perelli P-Zero tires. I bought it this summer this way. Honestly shocked that the car has such an aggressive rear end. but numbers don't lie. Thanks for all the info
 
The tires are big fir the car. They're Perelli P-Zero tires. I bought it this summer this way. Honestly shocked that the car has such an aggressive rear end. but numbers don't lie. Thanks for all the info
They may have used those big ass tires to reduce the gear ratio. Bigger the tire, the more it reduces your rear gear. Those tires come stock on BMW 7 series to give you an idea what how big of a car those come on.

These are your tires right?
http://www.tirerack.com/tires/tires...odel=P+Zero+Nero+All+Season&partnum=74WR90NAS

get rid of those quick!! They're 5lbs heavier than a properly sized tire!
http://www.tirerack.com/tires/tires...9P0XLOLD&vehicleSearch=false&fromCompare1=yes

10lbs of extra rotation mass kills performance!
http://www.w8ji.com/rotating_mass_acceleration.htm
 
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They may have used those big ass tires to reduce the gear ratio. Bigger the tire, the more it reduces your rear gear. Those tires come stock on BMW 7 series to give you an idea what how big of a car those come on.

These are your tires right?
http://www.tirerack.com/tires/tires...odel=P+Zero+Nero+All+Season&partnum=74WR90NAS

get rid of those quick!! They're 5lbs heavier than a properly sized tire!
http://www.tirerack.com/tires/tires...9P0XLOLD&vehicleSearch=false&fromCompare1=yes

10lbs of extra rotation mass kills performance!
http://www.w8ji.com/rotating_mass_acceleration.htm
Actually no. It's not the "Nero" tire. To change them I have to change all 4 tires and rims. I guess I just need to build more horsepower!! Lol
 
Actually no. It's not the "Nero" tire. To change them I have to change all 4 tires and rims. I guess I just need to build more horsepower!! Lol
FB_IMG_1476379575114.jpg

This is the car.
 
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What's your opinion on aftermarket sparkplug coil packs?? I've read a lot of reviews and they all seem to have a pretty good failure rate. Are they really that much better than stock or not worth the investment??
Thanks