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All manual tranny cars came with 3.42s.
 

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Manual transmission will have a 3.42 from the factory. Automatic transmission will have a 2.56 standard or a 2.73 optional (standard with Z51).

Inside your glove box you will have an RPO identifiaction label that will list all of your option codes. Look for the following code printed on the label.

For Automatics
GM8 = 2.56 ratio
GU2 = 2.73 ratio

For the manual
GU6 = 3.42 ratio
 

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Manual transmission will have a 3.42 from the factory. Automatic transmission will have a 2.56 standard or a 2.73 optional (standard with Z51).

Inside your glove box you will have an RPO identifiaction label that will list all of your option codes. Look for the following code printed on the label.

For Automatics
GM8 = 2.56 ratio
GU2 = 2.73 ratio

For the manual
GU6 = 3.42 ratio
:iagree:
 

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Manual transmission will have a 3.42 from the factory. Automatic transmission will have a 2.56 standard or a 2.73 optional (standard with Z51).

Inside your glove box you will have an RPO identifiaction label that will list all of your option codes. Look for the following code printed on the label.

For Automatics
GM8 = 2.56 ratio
GU2 = 2.73 ratio

For the manual
GU6 = 3.42 ratio
2.56 is the longest gear set they use correct?
 

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If any one is interested, I have an EXCEL file that calculates the RPM's.
Enter your own data for transmission ratios, tire diameter, final gear ratio, and caution & redline RPMs.
Just send me a PM with your email
 
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