First, I want to give credit to Sonoraed for the idea -- although I found a post from a member named "stuart" (he hasn't posted since 2007) over on the old site from 2000 that was exceptionally prophetic.
Second, sorry for the poor write up. I was so mad after having a marine wiper motor recommendation go horribly wrong that I was scrambling to just get it done, and neglected to get really good pictures as I was doing it. This is my best attempt to reconstruct the build with all of the details...
So we all know how pathetic Chrysler's attempt at the 89-91 wiper motors was. The problem has been that working motors are non-existent, and if you could find a working one chances are it won't be working for long. We need a suitable replacement that is easy to source, easy to install, and works in the confines of the tiny space in the tailgate where the original motor sat.
The Durango has a suitable replacement. I know 100% that the motors from 1998-2000 will swap in perfectly. The motors will work from 2001-2003 as well, but there is a possible catch: I have seen some of the motors from these years missing the small black control box -- suggesting the continuous/pulse/park function is handled elsewhere in the vehicle's electronics. You need a motor with the "black box." More on that in a second.
You need to pull EVERYTHING off the donor vehicle. Just make sure the arm, mounting nut and all of the spacers/covers/gaskets are there before you start. If you are missing any of the components just look for another donor vehicle -- this is super easy to make work if you have everything, but probably not workable without some significant fabrication effort if you do not...
From the outside, pull the arm, dish-shaped spacer underneath the arm, and the motor mounting nut. As opposed to the mounting nut on the 89-91 GWs, you will not
snap off the motor housing when you remove the mounting nut, so feel free to use a little elbow grease if needed to get it off. Then carefully pry/pop off the outer half of the tailgate gasket. You should now have everything off the outside of the vehicle. Here are some pictures of what you need to get. The wiper arm (and the little plastic trim piece/grommet) is not shown.
Then go inside the tailgate, and remove the large, cheap plastic trim panel. It is held on with a couple of screws and some trim panel grommets. The wiper motor will be right there, held on by two 10mm bolts. Pull the motor, making sure you get the inner tailgate gasket when you take the motor out of the tailgate
. I cannot stress how important this one little piece is/will be. You might need to pry at it a bit, or go back outside and push it back through the hole. Just get it. Now trace the 4 wire harness past the plug, and get as much of it as you can. Cut it back at least 8-10" if possible. You'll now have both sides of the harness -- the part attached to the control box (black box) and a good length of it on the other side of the plug as well.
You'll now have all of the parts you need for the swap. Here is a picture of the motor you are looking for:
Now the mount for the motor needs to come off. Pull the two bolts mounting it to the motor, and priy off the little cable stay that is attached to the harness. The control box is also attached to the mount, and needs to come off. It 'clicks' into the mount and is held there by a little tab, but I couldn't get anything thin enough to push in there to try and release it. I just gently (but firmly) pried it off of the mount with a large flathead screwdriver at the point noted.
Now for the fun part -- cutting on your perfect tailgate. There's no way around this -- nobody is ever going to reproduce that original wiper motor, and nothing else on the planet will work and fit in that small hole. You have to make the decision now -- busted motor (or an empty hole, if the motor is gone) or perfect, working motor that will require a little fabrication. There's no going back after this!