Do i need to "break-in" or "wear-in" my new rear gears?

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I pulled out of ford after they put mine in (3.73s)....laid her to the floor I couldn't wait to see what they could do!!!! woohoo :eek: There was a whine....my plastic speedo gear winding up (2.73 speedo gear) and speedometer was reading well over 100mph :D only doing 60mph.

Like the other guys said...take it easy at the very first to make sure they are set right ....then driver her like a rental.....well maybe not THAT HARD. haha :D

I have had the gears for almost two years and NOT A SINGLE PROBLEM after laying into it moments after install.