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So i noticed when i go through the speed traps it says im going 40 while my speedometer says im going 45, the gears in my car are amazing for take offs but wont hold its own over 100 mph like other mustangs, what gearing in the rear do you think i have?
 

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2.73s are Stock and 3.08s are Optional. Look at the Door Sticker and under Axle if you have the Letter "Z" then its a Traction Loc 3.08 and if it has the Letter "M" then its 2.73, also if there is still the original metal tag on the rear cover you will see the numbers on it.

if someone switched them out and arent stock, then jack up the rear, mark the tire and driveshaft, give the tire 1 full rotation and see how many times the driveshaft spins. for example: if the driveshaft spins a little over 4 times to 1 full tire rotation then its 4.10's.
 

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you could also have factory 3.27s. but to be absolutely sure, just do the test mentioned above.
 
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