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1990 Mustang GT, Rear gear ratio by door Code?

9715 Views 7 Replies 6 Participants Last post by  MarkS93, 
MY 85 GT
Anyone know how to determine what gear ratio you have by the door code?..I have a 90 GT door code...M under axle code...does anyone know what ratio that is?...
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SilverBullet07
i have no clue, but you can jack your rear up, mark the driveshaft, and spin your tires in neutral. then you can figure out the ratio that way
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Badfish
Yeah do that. I dont think the door tag specifies gear ratio, only whether its a Trac Loc or open rear. Could be wrong there though.
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MY 85 GT
I thought the axle code told you what gear ratio it has?...Im thinking its 2.73's but maybe its not..:)
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Badfish
M means 2.73, I think z means 3.08, I think thats all you could get in 90?????.... You might look on the pumpkin to see if there is a tag. Maybe 3.27 was available. And I am pretty sure all 87-93 had Trac-Locs, not sure, wish i could be more help. So ignore my first post, its wrong. :p I believe.....
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m=2.73 z=3.08 e=3.27
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dreger
90 stock stang said:
m=2.73 z=3.08 e=3.27
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Yup bang on for sure.Mine is also an m code car and is 2:73 ratio.
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MarkS93
Yea, mine WAS code M too....2.73's. key word there....WAS!!! :winks
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