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Rear Differential Magnetic Drain Plug

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Old Sep 8, 2020 | 12:09 AM
  #1  
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Default Rear Differential Magnetic Drain Plug

Can’t find a decent magnetic drain plug for the rear diff.
There’s a GM 19256068 but I can’t find correlating details or photos showing a magnet and or a crush washer.
If I have the actual plug size/ thread pitch I can cross reference It and use one from something else

Trail-Gear Magnetic Drain Plug Kits 140033-1-KIT

Summit ^

If anybody has had luck finding a magnetic drain plug I’d appreciate some help please
Thanks
Hary
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Old Sep 8, 2020 | 10:41 AM
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If you don't mind me asking, why are you considering a magnetic drain plug for the diff? The diff has a big magnet in it already to catch ferrous debris. If it is overloaded then it's time to disassemble and clean out the diff IMO.

For reference, my C5Z's diff's magnet was at its limit:


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Old Sep 8, 2020 | 10:43 AM
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Originally Posted by MetalMan2
If you don't mind me asking, why are you considering a magnetic drain plug for the diff? The diff has a big magnet in it already to catch ferrous debris. If it is overloaded then it's time to disassemble and clean out the diff IMO.

For reference, my C5Z's diff's magnet was at its limit:

Mine was 4 times that much. That's what i had to do. The reason was where the cv go into the diff i had the shaft moving 1/2 inch side to and up and down. Tore it all apart. Spider and out shaft gear missing chunk. The ring and pinion had chunks missing also but left them. It still worked because the matraial was ground steel acting like the clutches.

Last edited by helga203; Sep 8, 2020 at 10:51 AM.
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Old Sep 8, 2020 | 11:31 AM
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Originally Posted by MetalMan2
If you don't mind me asking, why are you considering a magnetic drain plug for the diff? The diff has a big magnet in it already to catch ferrous debris. If it is overloaded then it's time to disassemble and clean out the diff IMO.

For reference, my C5Z's diff's magnet was at its limit:

Wouldn't it make more sense to remove the debris while changing the fluid then having that build up? How are you supposed to know it's there? Is it visible without disassembly? I'll be doing a tear down and changing the final drive this fall but I've always used a magnetic drain plug in all my cars trans/diffs and it's saved me twice now
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Old Sep 8, 2020 | 01:49 PM
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Originally Posted by Hary Gahtoe
Wouldn't it make more sense to remove the debris while changing the fluid then having that build up? How are you supposed to know it's there? Is it visible without disassembly? I'll be doing a tear down and changing the final drive this fall but I've always used a magnetic drain plug in all my cars trans/diffs and it's saved me twice now
I have a strong suspicion that a magnetic drain plug will hold substantially less debris than the internal magnet - but I do see your point. Though I wonder how often you change your diff fluid? It's not a very regular maintenance item for most people.

My clutch packs were toast - the breakaway torque was zero. I didn't know the magnet was so saturated, but if your diff's breakaway torque is zero it's time for a LSD rebuild anyways (and your magnet could be saturated too).
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Old Sep 8, 2020 | 04:37 PM
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I change diff fluid < 1500 mi. Then at 25,000 and 50. The worst is the 1500 point. The car we just bought has 53,000 and I highly doubt it got changed at all
I see your point about the internal magnet. Engineers may not have liked the location of the drain plug for collection of trash for the average owner who leaves it alone. I'd like to know, what's floating or come loose and pull it with the drain plug if I can
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Old Sep 10, 2020 | 09:44 AM
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One advantage of the drain plug with magnet is you would know if you had substantial buildup without pulling the cover. If drain plug is heavy with debris, time to pull cover and see whats going on.
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Old Sep 10, 2020 | 12:47 PM
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Originally Posted by helga203
Mine was 4 times that much. That's what i had to do. The reason was where the cv go into the diff i had the shaft moving 1/2 inch side to and up and down. Tore it all apart. Spider and out shaft gear missing chunk. The ring and pinion had chunks missing also but left them. It still worked because the matraial was ground steel acting like the clutches.
Wow. Pretty interesting, I never changed my fluid and need to NOW. Now I would if I should open it up instead for inspection.
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Old Sep 10, 2020 | 01:11 PM
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Originally Posted by My Vette Life
Wow. Pretty interesting, I never changed my fluid and need to NOW. Now I would if I should open it up instead for inspection.
Check your LSD breakaway torque first. If it's low/zero, it's time to rebuild the LSD anyways.
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