Are my RPM's too high

[2003_GT]

When im doing 75mph im at about 2500-2700 rpms is this i little high???

BTW i have 3.90 gears (just installed)

 

[mustanggt04fast]

rpm

that sounds about right i have 3.73s in my 2004 gt and at 75mph it runs around 2200 2400 rpms

 

[Stan Weiss]

2564 RPM = 75 MPH with 3.90:1 and 245-45-17 tires

I have some Interactive JavaScript calculator on my web site -- Automotive Performance Software / Interactive JavaScripts Calculators
Calculate RPM given Speed(MPH), Rear Gear Ratio and Trans Gear Ratio