Originally Posted by turb934
Break in is more for the transmission & rear differential. Not as much of an issue for the engine
You are correct. Having spent enough time with the guys from ///M (Albert is great!) to know that after the first 100 miles the bearing are set etc. the rest of the break in is because of the rear diff and transmission as far as the drive line is concerned. The rear diff is very sensitive and can develop a whine if not broken in the right way- usually 300 miles does that then drive it like you stole it!
Remember the brakes and tires need about 300 miles as well as the suspension so after that magic 300 number go to town on it.