Won't roll up properly, leans towards front. I believe the actuator is working properly and I know the window is on both tracks. Rolls down fine except for a little hitch about 75% down that I have been fighting with for the 10 years I owned it. Wondering if I lost a part or which part is broken. Any ideas ? Any schematics ?

thanks

 

One or more of these may help.. bear in mind that usually the windows end of the regulator arms act the same , power or crank.
https://www.google.com/search?q=88+s10+widow+regulator

Especially this:
'88 S10 window problem - Chevrolet Forum - Chevy Enthusiasts Forums
Note the need for 'clips'

 

yeah if you are sitting in your truck looking at the driverside window on the top left there should be this little hole. theres a clip that snaps inside of it that is supposed to guide it up and down the track. the help section usually sells them