gear install ?

In general when guys refer to "gears" they are talking about the ring and pinion gears in the differential. This is the rear axle housing. I have always taken the gears and the car to the shop and had them install them. Unless you have a bunch of other issues it should be in and out in a day depending on how busy they are.
 
so i dont take my tranny out at all and yes im talking about the ring and pinion

UUUUUUHhhhhhhhhh....no. No, leave your transmission alone, it has nothing to do with your ring & pinion gears.

In fact, when you take it to a shop and they put it on a lift, have them show you what is what, and explain in a nutshell what it does.