They are simple to rebuild... I did mine in my 86. Do you have the 84-86 motors or 87-88 motors? Either way I bought the replacement gear/kit from Rodney Dickman and he sends instructions on how to rebuild them. I am not quite sure if yours need to be rebuilt but something isn't working right.
If you have the 84-86 motors check out Buddycraigg's videos on Youtube. Just do a search using Buddycraigg and Fiero and you will find them. He has done a complete set of videos to trouble shoot the motors and rebuild them.
Posts: 743 From: Nevada, Iowa, United States Registered: Dec 2005