rear differantial ratios
Race Director
Joined: Apr 2014
Posts: 15,067
Likes: 4,758
From: Washington Township Michigan
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Manual trans. has 3.42 rear axle ratio
Auto trans. has either 2.56 or 2.73 ratio depending upon additional options
Auto trans. has either 2.56 or 2.73 ratio depending upon additional options
Burning Brakes
Joined: Aug 2010
Posts: 1,194
Likes: 76
From: Great River NY
Check the RPO codes in the glove box. If it shows GU2, you have 2.73 gears; if not, you have 2.56's. GU2 was part of the Z51 option for '08 and '09. It was also a stand-alone option for those two years, as well.
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