How long is the break-in period?

<p>Your new transmission has a 500 mile break-in period, during which the transmission should be operated rather gently to allow the synchronized gears to self-tolerate. After this break-in period, drain your transmission into a clean pan, check for abnormal particulate in the fluid, and refill using GM Synchromesh, Pennzoil Synchromesh, or Mobil 1 ATF.</p>

<blockquote>NOTE: Some sloughing off of material is expected when performing the break-in fluid change. A magnet in the bottom of the transmission will trap ferrous particles, but it is normal for some aluminum and brass to be suspended in the fluid.</blockquote>

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