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I believe the 84-85 window motors are different from the 86 and up, seems they found earlier motors ran too slow and didn't hold up as well.. I'd check with http://contemporarycorvette.com/ for a used or Zip, Corvette Central or Ecklers for a new replacement..
Keep in mind, many 86 still had the 84-85 style motors.The newer style late 86 set up came out on convertibles in the mid year introduction.I was pizzed because my late model 86 with alloy heads still got the cheezy ribbon gear style set up.Many catalogs companies dont list this.I had to order a "85" year motor because they tried to tell me different over the phone.
You can take the entire window regulator/w motor out of a later car and adapt it to your earlier 86-84 models.You cant just use the later motor alone.I may do that someday when the window motors and ribbons break AGAIN.Just a matter of time.:(
In agreement about some 86 have the ribbon power motors. I read that the 86 door are all drilled to use the newer style scissor set up, while the 84-5 are not. (I don't know for sure as I have the newer setup)
I can tell you that the '86 & '96 motors are the same. I just took the guts out of an 96 to put in my '86 ragtop, the only bad thing is that the threaded holesare stripped out so now I've got totake the window out and remove the whole mess and get the dealership to put those giant rivets in, by the way can someone tell me how to take out the window? A word of advice, take the motor apart before while still in the door, chances are you can just change the brushes or armature or both without having to go through the rivet/ glass thing that I'm forced to do!
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.