diff sizes?

[junior19]

wat are all the diffirential sizes that will fit in a 3.8 mustang automatic and which of those would be the best? wat is the stock ratio?

 

[lamothe1]

what year Mustang?

 

[jgt58]

94-98 ratio's are 2.73's

99+ are 3.23's

any 7.5" ratio gear will work. If you have an automatic I suggest 4.10 ratio to really wake up your car. After you have the swap done if you have a 99+ you will need an handheld tuner to correct your speedo , if it's a 94-98 you'll need to change out the speedo gear....