Why break in new gears?
05-18-2008, 09:35 AM
#1
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Why break in new gears? When cars are purchased new, we often see guys at the track. Also, guys without daily drivers aren't driving 500 miles to break in new gears. I went 77000 miles on my 3.42's from the factory without ever changing the fluid and still had no issues and no whine when I changed them. (And my car doesn't crank without at least one WOT during the drive
) So, why do gears need to be broken in?
) So, why do gears need to be broken in? 
05-18-2008, 12:29 PM
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Because you have two surfaces that wear against each other. When parts are new, those surfaces don't match up perfectly. The break-in procedures are there to allow for the surfaces to establish a perfect match and a controlled wear pattern--providing a long service life for the parts. If you skip the break-in, there is a chance you can overheat and damage the contact surfaces.
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05-19-2008, 08:28 AM
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Banging some gears
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well if im told to break mine in i'll assure you im gonna break those ******* in! Just dropped some cheddar off on a brand new 12 bolt from moser fully assembled... not gonna risk tearing it up after spending that kind of cash! if you are told to break them in i say why not be patient and break the ******* in!
05-19-2008, 09:47 AM
#10
Because you have two surfaces that wear against each other. When parts are new, those surfaces don't match up perfectly. The break-in procedures are there to allow for the surfaces to establish a perfect match and a controlled wear pattern--providing a long service life for the parts. If you skip the break-in, there is a chance you can overheat and damage the contact surfaces.
05-19-2008, 10:57 AM
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You dont. Anyone ever buy a new car that was rear wheel drive? Is the rear quiet? How many heat cycles did you drive it when you picked it up from the dealer? I assure the factory doesnt heat cycle their cars. Whine is caused by improper set up. You should be more concerned with new bearings than a contact pattern. No matter how you drive the car, hypoid gears will establish a pattern on their own. Gears are heat treated to about 1600 degrees F before they leave the plant. There is nothing that a few 200-300 degree heat cycles will do to help. Doing the heat cycle thing certinly will not hurt your car but it wont help it either. So if you want to go believeing it helps, go ahead. Drive it for 1000 miles and chaing the oil to flush out any debres caused by the bearings and your good.
05-19-2008, 12:14 PM
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You dont. Anyone ever buy a new car that was rear wheel drive? Is the rear quiet? How many heat cycles did you drive it when you picked it up from the dealer? I assure the factory doesnt heat cycle their cars. Whine is caused by improper set up. You should be more concerned with new bearings than a contact pattern. No matter how you drive the car, hypoid gears will establish a pattern on their own. Gears are heat treated to about 1600 degrees F before they leave the plant. There is nothing that a few 200-300 degree heat cycles will do to help. Doing the heat cycle thing certinly will not hurt your car but it wont help it either. So if you want to go believeing it helps, go ahead. Drive it for 1000 miles and chaing the oil to flush out any debres caused by the bearings and your good.
Who the hell has patience for break in.
05-19-2008, 01:29 PM
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Break in is extremely important to enusre you do not overheat the gears and burn them up. When you buy a new car the dealer recommends a break in on the motor right? In reality you are breaking in the entire drivetrain. The first 100 miles is the most important for "Heat Cycles". Drive 15-20 minutes increments then cool for 15 minutes. Once 100 miles approaches distance wise is no problem. No track time until 500 miles and the fluid is changed.
Jeff
Jeff
05-19-2008, 01:31 PM
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Break in is extremely important to enusre you do not overheat the gears and burn them up. When you buy a new car the dealer recommends a break in on the motor right? In reality you are breaking in the entire drivetrain. The first 100 miles is the most important for "Heat Cycles". Drive 15-20 minutes increments then cool for 15 minutes. Once 100 miles approaches distance wise is no problem. No track time until 500 miles and the fluid is changed.
Jeff
Jeff
