how can u tell what gears you have

 

Lol not sure without taking the cover off the rear and looking. My car has 4.10s through an a4 and it reads 80 at 60 lol 2300 rpms

 

after u take the cover off how will u no

 

http://shbox.com/1/gear_ratio.jpg

that should help you and what car you got. year, model, auto or standard? is the rear stock?

 

Not an "engine" question. Moving to "Drivetrain".

 

If it is stock gears, look at the RPO codes. GU2 = 2.73, GU5 = 3.23, and GU6 = 3.42

 

Might want to add specific info about your car (a "Signature"), like year, model, engine, trans and any major mods. Make is easier for people to help you.

 

i have a 95 Z28 auto trans stock gears

 

where r the rpo codes located

 

glove box door or the build sheet if you have it.

 

If you don't want to do any of that, jack up the rear and count the rotations of the driveshaft as you rotate the wheel one turn (ex. 2-3/4 turns of the driveshaft would be 2.73s). With stock gears and auto, will have either 2.73s or 3.23s. If you have first gear selectable on your shifter, then it came with 3.23s. If it only starts with "2", then it came with 2.73s. You can also use an online gear/RPM calculator to figure it out.
http://www.f-body.org/gears/

 

thanks i guess i have 2.73s.how hard is it to put some 3.73s in and will i need to buy a programer to fix my speedo