Is there a magnet in the Differential on a 91?

[bluestream]

I want to change the differential fluid in my 1991 Explorer. I was just going to suction out the old fluid, and refill with 80W90 GL5 so that I could leave the rear cover on, but I wondered if there is a magnet somewhere inside that should be cleaned. This diff has the plastic cover

 

[Ross-N-Chicago]

No magnet. Be sure to use a small vaccuum line or it won't fit in the hole opening. Dropping the cover just takes longer but is easy...