Stock gears or no?

[Amaritto]

I just purchased an 04 GT from a dealership today and think this car has gears. Everything on the car seems to be stock except for a magnaflow cat back.

Speedo seems to be about 10mph off at 70mph in 5th gear. Rpm's at 70 in 5th are 2100-2200. Is there a chart for the GT's that would list the right ratio for this?

Been over 6 years since my last post on this site, but im baaaaack. lol

 

[BlackGT4.6]

Is the car a 5 speed or auto? If its a 5spd I would say they are stock gears.

 

[Amaritto]

5 speed. Cousin has 03 GT and at 80mph his rpms are the same as mine at 70.

 

[laserstang21]

i have stock gears and at 70 im hittin bout 2100-2200

 

[BlackGT4.6]

I would say with about 90% assuredness that they are stock.

 

[BigDave06]

I see near 2500 around 70 with 4.10's a 3650

 

[merc123]

Stock.. with the possiblity of 3.55's.

For the TR-3650 use these ratios: 3.38, 2.00, 1.31, 1.00, 0.67
http://www.allfordmustangs.com/Detailed/608.shtml

The 3.55's will turn ~2179 RPM's with stock tire sizes

 

[Pearl02]

I have 3.73's and at 70mph my tach is around 2200rpms. My stock gears(3.27) at 70 would tach around 1900rpms. I would say you have 3.73's. You could always jack the car up and turn the tire and count the rotation of the driveshaft. That would tell you what gears you have. Pearl02.

 

[Amaritto]

I just have to jack this thing up and actually get a for sure answer today. I am ok with them being stock, but not ok with my speedo being off 10mph...

Thanks for the graph, that is exactly what I was looking for. According to it, I should be stock but like you say, maybe 3.55s.

Will update today. Thanks again

 

[Smokeurhonda]

Just do the digital speedo for accurate RPM's, maybe somebody had a set of whiteface gauges in it and screwed up the needles when replacing? I snagged a set of gauges off a dealer car one time and screwed up the fuel gauge on it cuz I ran outta time. Car came back in for service a month later and I saw the gas light on while it was showing a quater tank. Opps

 

[forum155pl]

car salesmen LOVE to say that cars like ours have gears... ive heard that from multiple salemen when when i was shopping for a stang..

not that i'm doubting that your car doesnt have em.

 

[Skidzz]

I think it sounds like you have 3.55's, although I don't know why anyone would spend the money for such a small change...

 

[Back in Black]

Sounds like sombody's ready to put in some 4.10's!!!