i went on ebay to look for stuff for my car and found 3.73 gears for 75$, when i put these on will i really notice the power change. and i was going to have my uncle (mechanic) put them on, is there anything else i need to buy to install them?
install kit - master gear set.
T-Lok - worth the $ to get both tires spinning.
Axle seals - night as well since the axles get popped out anyway.
oil and FORD friction modifier.
And yes, you will feel the difference if it is a stick.
Auburn and Eaton posi's are nice as well. Yukon makes some decent stuff too.
When I picked up what I did, cost was a factor as well as quality. Eaton is the best posi out there, but you will pay a butt load for it. All depends what you want to do with the stuff, ya know?