3.42 vs 3.73

[ccapehartusarmyINF.(ret)]

to ad to what hes saying
you really only need a 3.73 if you have a 4speed 4l60E a 6speed tranny is geared low enough so that a 3.42 is plenty

 

[Gurrzt]

Try this sight, plug in the numbers:

http://www.andysautosport.com/learning_center/calculators/

Scroll down to the gear ratio calculator.