The old Crown Wheel and Pinion whining questions...

[jondee86]

Bearings will be be a little tighter than before due to pre-load. They will
loosen up a bit as they bed in. I don't even know the recommended
break-in procedure for a new CW&P, but gears always need a period of
light load running to burnish the mating surfaces and let them bed to each
other. So I would say just take it easy to begin with... no heavy torque
loading... just normal "granny style" driving for a while. Then raise the
rpms and a bit more loading by running thru the gears at less than full
throttle until you have 1000 km or so on the diff. Change the oil and start
load cycling in earnest

Cheers... jondee86