I've heard you have to break in new gears as well and not to beat on them initially. I've heard that when you first get gears that they are hardened and if they are shocked they are more likely to crack or chip. Once you heat them up they lose part of their tempering and are slightly softer and start to develop the tooth contact pattern and also have more give to them when you really beat on them. That's why you hear about drag racing gear sets not being suitable for the street, they're so soft they wear out really quickly(within several hundred miles) but can survive harder launches and not break.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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