Help With Gears

Can someone help me out with gears........I understand that they get your power where it needs to be but what do all the numbers mean i.e. 3.73's , 4.10's I am confused as to what that is also explain the speed cal part and how much does something like this cost......gears and all the labor and the speed cal???

Also If I am not a die hard drag racer and mostly just want them for the street and an occasional drag strip run would I still go with 4.10's or which would be best for a street application. How bad will it affect your top speed....will you still be able to reach well over a 100 mph???

Thanks for your help!!!!

:scratch: :confused:
 
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