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I had the same experience. My motor was very loud. One of the magnets had come unglued and was rubbing on the armature. I used JB-Weld to refasten it, cleaned and lubed everything and reinstalled. The motor needed a new ground so I ran a wire from under one of the bolts holding the motor case together to the place where the engine ground strap connects to the body. The motor now runs fine.
However I had two problems. First, it was hard to line up the linkage with the motor shaft (when you see it, you'll know what I mean). It took two of us, one to slightly turn rhe wiper arm while the other pushed the linkage onto the shft when the shaft and linkage lined up. I did this once by myself but it took a lot of trial and error. With two, it took only a few seconds.
The second prolem is with a water leak I created. The motor shaft goes through a rubber grommet in the firewall to reach the linkage connection. When I installed the motor, I pushed out this grommet and had to pull out the motor and reinsert the grommet. I must have broken the seal around the edges of the grommet because there is a water leak there but not around the shaft. I plan to try to reseal the grommet with some silicone as soon as things dry out. I might have prevented this leak if I had lubed the motor shaft so it would slide through the grommet more easily.
A very satisfying DIY job considering the cost of a new or rebuilt motor!
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