Mike Baier(@Mike__Baier):Yes. The liner truck uses a model 3 battery back (or two batteries depending on the liner truck model) and a slightly modified model 3 rear drive unit. We just take the differential out and replace it with a spline but other than that it’s basically stock. The drive unit acts as the primary mover for a hydraulic pump that creates the fluid power needed to rotate the trucks 4x hydraulic motors. All of these details and more in the @teslaownersSV video that came out yesterday as well:

Mike Baier

@Mike__Baier

Removing traffic from the world one tunnel at a time. Director of Production, Electrical, and Software Engineering at The Boring Company

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Mike Baier@Mike__Baier

2026.07.19 18:10

Yes. The liner truck uses a model 3 battery back (or two batteries depending on the liner truck model) and a slightly modified model 3 rear drive unit. We just take the differential out and replace it with a spline but other than that it’s basically stock. The drive unit acts as the primary mover for a hydraulic pump that creates the fluid power needed to rotate the trucks 4x hydraulic motors. All of these details and more in the @teslaownersSV video that came out yesterday as well: