Mine's an auto but also came with 2.73's. Look in the door panel for a code. Someone here has the translation I'm sure since I got it for mine. Also, I think on the rear pumpkin itself, there is a label and should say straight out what your ratio is.
James
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90' Mustang GT Convertible-
C4 w/ manual body
4.10's soon to be 3.27's
2 Ch Flowmasters
1/8th ET 9.04
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