[bparker010]

I have a 2004 Mustang GT that I bought used from a car broker. The car has an intake and an exhaust but I wanted to know if my car has any gear upgrades.

Its an automatic and when I'm going 50 mph it's at 2000 RPM's...

Is it stock or do you guys think I have upgraded gears??

Thanks for any help

[Schon]

its stock.mines the same way

[bparker010]

Wow, I would hate to see what it would be like with 4:10's.

Thanks for the help

[bparker010]

Although isn't your mustang a 5 speed?? Mines an automatic 4 ....wouldn't that make a difference??

[ManleyWilliams]

Yeah i have a auto with 3.73's and run 70 at about 2400 2350 so i say there not stock.
And i run 50 at 2000 or lower so yeah

[Schon]

PaladinMicro

this might help. the chart is in 5th gear so use this to help. with all this info you pinpoint exactly whats going on in that rear


Base (T5OD)
GT (T45)

Gear ratio - 1st 3.35 3.37
Gear ratio - 2nd 1.99 1.99
Gear ratio - 3rd 1.33 1.33
Gear ratio - 4th 1.00 1.00
Gear ratio - 5th 0.68 0.67
Gear ratio - Rev. 3.15 3.22
Rear axle ratio 3.27:1 3.27:1
4-speed Automatic Transmission



Base (4R70W)
GT (4R70W)

Gear ratio - 1st 2.84 2.84
Gear ratio - 2nd 1.56 1.56
Gear ratio - 3rd 1.00 1.00
Gear ratio - 4th 0.70 0.70
Gear ratio - Rev. 2.32 2.32
Rear axle ratio 3.27:1 3.27:1