Map the space around the opening
The visible opening is only one part of the installation. Hardware needs room beside it, the track needs a route overhead and the moving door needs clearance into the garage. Describe beams, ducts, lights and shelving when requesting a proposal. A low obstacle away from the opening can still affect the path. Leave final measurements to the installer; do not climb beside a damaged or unsecured assembly to collect them.
Compare the proposed track arrangement
Clopay distinguishes standard, low-headroom and high-lift arrangements. Those descriptions explain the basic layout, but they are not interchangeable kits selected by ceiling height alone. Ask which configuration is proposed for the exact door and how it affects the operator. A sketch of the door fully open can make the plan easier to understand than a list of hardware names.
Protect the agreed clearances
Plan shelves, overhead racks and new lighting after the door path is established. Include the operator, its controls and access for future service in the discussion. If a ceiling alteration is part of the project, identify who designs and completes it. Keep the track specification with the door record so a later storage project does not accidentally occupy the working space.
A replacement door needs a compatible track system
Do not assume a new door can reuse the existing tracks merely because the opening stays the same size. Section thickness, door weight and the required path of travel can differ. DASMA treats the tracks and sections as a system and recommends track designed for the specific door. Ask the proposal to identify the retained and replaced components, with compatibility supported by the selected product instructions. This decision is separate from reusing the rail of a ceiling-mounted opener.
Your questions
Will a wall-mounted opener remove all overhead clearance requirements?
No. It changes the operator location, but the door and track still need an appropriate travel path. Review the complete assembly.
Can a standard track simply be shortened to fit a tight garage?
Do not modify tracks as a homeowner solution. Have the door installer assess a compatible configuration and its manufacturer requirements.