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  1. M

    how does the Jackshaft 3800 GDO work?

    OK, this sounds like a stupid obvious question, but I can't get my head around it. I would like to install a Liftmaster 3800 GDO because I have a 4-post lift. I was going to fabricate (jerry rig) a bracket and modify my conventional GDO to work on the jackshaft, but talked my self out of it when...
  2. M

    converting over-head rail/chain opener to a jackshaft opener?

    Hey gang, new to the forums. Good news- I just ordered a Bendpak HD-9 4 post lift- yea! bad news (not really) is I will need to change my current GDO from a standard rail/chain to something else to get more height out of the lift. I was thinking about pulleys, disconnecting, etc, then I noticed...
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