Since I can't think of a way to say this delicately, I guess I'll just say it. If your mechanic does not know or cannot figure it out, then perhaps you should be looking for another mechanic
. The reason I say this is the van's suspension isn't that much different from many other popular vehicles. Of course the #1 thing here is safety. After you have the vehicle on jack stands (supported by frame), just be sure to release the tension of the torsion bars before trying to remove the a-arms. For more specific instructions refer to the front suspension section of the factory service manual. Here's a link to down load the 87 manual in PDF form:
https://drive.google.com/file/d/1q4u...7wOD7nKyF/view