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If yours is still the original type, and I assume it is, it's two pieces of heavy gauge sheet metal, pressed to a cast (potmetal or zinc) hub gear. What's probably happened is that the arm has popped off the hub and the whole thing has collapsed into the door.
You CAN fix it. (No, the rear door is not the same, but parts from the opposite front door can be made to work if yours gets too worn out to continue)
What you will haveto do is remove the whole regulator (unplug power, get all pieces unclipped and out to the workbench). Remember that the red light is one of the clips holding on the door panel....
Ok, figure out which position things are in when the window's up. You can reconnect the motor and switches and run just the motor. Position the gear segment so it engages with the drive motor at the full "up" end of the segment. The zinc gear is used to hold all the pieces together. It engages with the segment piece, and the spring. The spring should have the least tension when the window is up. That's where it has to be when you reinstall it. This is probably the most frustrating part of the job. A helper is a big plus. You may want to get the assembly out of the other door if it looks confusing. They are mirror images. You have to hold the arm in place, engage the spring with a little bit of tension, and HAMMER the splines of the zinc gear so that the thing will lock together again. I used a socket about the same diameter as the zinc gear. You just need to swage the ends of the gear teeth a bit.
If you have the other out I think you'll see what I mean. Beats paying hundreds of dollars for one. My 740 has been fine for a year now since I repaired mine. Best of luck!
Rob Bareiss, New London, CT USA 86 244, 87 244, 88 744
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