I just had my 31 spline axels, 3.73's, cobra lsd, and all new bearings and seals installed last night in my 01 gt. The shop said their is no breakin period just drive home normal since it was a 80mile drive for me from pa to md and I should be fine. Is this true if not what is the break-in period procedure? and does the rear fluid have to be changed again shortly? just wanna know wanna get back to the track :rockon and not mess nothing up.