Trans Pan Magnet: What It Catches

The pan magnet catches metal wear particles. What's on it tells you everything about trans health.

Shop rebuild kits and parts by transmission

Get the parts for this repair
Shop 4L80E Parts →

What the pan magnet does

  • Catches ferrous (iron/steel) particles
  • Keeps them out of valve body
  • Prevents valve sticking
  • Reveals wear pattern when inspected
  • Read our transmission pan inspection

What you might find

Fine gray dust:

  • Normal wear
  • Acceptable in moderation
  • Service interval fine

Visible metal shavings:

  • Excessive wear
  • Hard parts deteriorating
  • Plan inspection or rebuild

Large chunks:

Brass/copper-colored particles:

Aluminum flake:

  • Case or aluminum part wear
  • Investigate source

What burnt friction looks like

  • Brown/black flaky material
  • Not metal
  • Sometimes mistaken for dust
  • Indicates clutch wear
  • Read our burnt transmission fluid

During every pan service

  • Clean magnet thoroughly
  • Photograph if concerning
  • Re-install with new gasket
  • Document in service records

Read our how to flush transmission fluid

Upgrade options

HD magnet:

  • Larger surface area
  • Catches more debris
  • $10-$30 part

Multiple magnets:

Pan with drain plug + magnet:

  • Easier service
  • Inspect more often

Service interval implications

Lots of debris:

  • Shorten service interval
  • Inspect every 15,000 miles
  • Or plan rebuild

Clean magnet:

  • Normal interval OK
  • 30,000-50,000 miles

Read our transmission failure modes

When magnet inspection saves you money

What good rebuilders document

Need pan service parts or HD pans? Shop our complete catalog. HD pans, gaskets, magnets, filters. Free shipping over $70.

Related: