Here's a guide on my site:
http://fierodomain.com/content/view/172/100/And yes the rebuild can be done without removing the top part, the motor itself. The passenger side motor is more difficult, because there is a lip on the gear that will catch on the motor gear, but you can just pull it past.
Did you get the rebuild kit from Rodney? He includes very nice step-by-step directions with his.
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[This message has been edited by Xanth (edited 05-02-2007).]