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Old 07-19-2013, 08:08 PM
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debris on magnetic drain plug rear end

how much stuff on magnetic drain plug is normal for new gear set and posi at initial fluid change after break in?
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Old 07-19-2013, 09:31 PM
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As I found recently, a lot of stuff can be left behind (loose shavings) from the machining operations if the guy assembling the unit isn't attentive.

Whether the stuff you've found is new shavings or old machining debris.... that's a threshold question. Gear debris (hardened steel) will usually have jagged edges, old machined shavings (soft steel from the housing) will be smooth(er) at the edges. Look under a scope or a good jeweler's loup.
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Old 07-20-2013, 07:09 AM
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It should be a very fine powder and probably just enough to cover your thumb. If you have any chunks or shavings then you have another problem.
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Old 07-20-2013, 07:50 AM
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Something I didn't know that I thought I would share...

All new gear sets require a break-in period to prevent damage from overheating. After driving the first 15 or 20 miles you must let the differential cool for 30-40 minutes before proceeding. Drive 500 easy miles before towing. Tow for very short distances (less than 15 miles) and let the differential cool before continuing during the first 45 towing miles. Change the gear oil after the first 500 miles. This will remove any metal particles or phosphorus coating that has come from the new gear set.

Differential Installation Instructions | West Coast Differentials
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Old 07-20-2013, 05:56 PM
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Quote:
Originally Posted by big gear head View Post
It should be a very fine powder and probably just enough to cover your thumb. If you have any chunks or shavings then you have another problem.
yes it was a fine powder about a fingertip full, and 2 or 3 shavings
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Old 07-20-2013, 06:44 PM
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That should be fine. The shavings are probably just something that didn't get cleaned out before the rebuild. It's really hard to get everything out, which is why the magnet is a good idea. I wouldn't worry about it.
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