Brass replacement gears can be purchased at https://www.gruvenparts.com/gm-truck-brass-seat-fwd-aft-adjustment-gear-set/
You can also access a DIY pdf there with the list of tools needed for this job.
If you need to fix the height adjustment gears instead, parts can be purchased at gruvenparts.com. Check out this video for instructions https://youtu.be/Yagesr0Q_6c
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