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1994 Firebird Formula 381ci LT1 / TH400+GV O/D
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7.5/7.625" 10-bolt, very weak. Or are you just asking for the ratio?
 

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Your original gear ratio will be on the rpo sticker, if 84 models had this. But ratio would be one of the following GU2= 2.73, GU4= 3.08, GU5= 3.23, GU6= 3.42, GU7= 2.77
 
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