musicaldoc
Full Access Member
How long is the Break-in mileage in your opinion?...my dealer says that it's almost 1800 miles !!!
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Not true,otherwise your "brand new" car would have some mileage on it when you bought it.Again it's not just the engine you are breaking in.I was under the impression that most modern engines come from the factory already "broken in" and there's no reason to do this...
The diff gears need to be heat cycled to make them strong and last,bassically drive until the diffs are at operating temps,then let cool completely then repeat.Basically "heat treating" them to make them harder and getting the wear paterns set.And no you do not need to rebreakin the gears if you add a ARB,now if you regear(to 4.10's) then yes you would need to break in the new gears.Breaking in the gears is real important if you plan on towing alot and at the max rated tow lbs for the vehicle,more important on 3/4-1 ton pickups.Can Anyone Explain To Me Why The Differential Gears Also Need To Be Broken In? This makes no sense to me.
If I get a replacement diff like an ARB or something, do I need to break it in also?