I bought my SS used and Im not sure if the gear has been changed yet. I planned on doing a 3.73 but in a way I think it might already have something. I dont know if this is enough info but at 70mph in 5th Im pulling 2500 rpms.

 

Assuming that you have the stock SS tire size (275/40ZR17), your numbers indicate that you have stock 3.42:1 gears.

 

Yep, stock tire size. Thanks for the help, I didnt want to waste the money if it already had something and the 3.42 pulls better then I figured it would.