I had a heck of a time moving the windows in my 2 door sedan. Pretty much all stuck but not jammed, the cure without disassembly, was to simply spray some good penetrant oil into the regulator at the crank shaft, pivots, rollers, sliders and geared points on the arms and regulator. Freed them up and they work like new now.

Here's some illustrations from the 1965 Fisher body All Lines service manual. Should cover at least any 65-66 B model 37. 60's GM B bodies for the most part share the same internals across each model year. There is some more detail in the book if you need it. Hope this helps.

Someone here might have a spare Fisher all line body manual they'd sell, but in the meantime this should do,

http://toms427impala.info/CT/66fishermanual.pdf

I had a similar problem and took the assembly out and replaced the rollers.  It was a while ago, but I also replaced the window roller plate

 I replaced the rollers as well as putting new rivets in the pivot points

Had the rivets  peened over .. 

Bought parts from H&H and Altha Fasteners

-- Edited by oshawacliff on Thursday 11th of February 2021 04:31:35 PM