Gearbox Remapping Cumbernauld. Our gearbox remapping in Cumbernauld tunes the TCU (transmission control unit) on DSG, ZF and Powershift gearboxes for faster shifts, raised torque limits and higher clamping pressure. Pair it with an engine remap or run it standalone — either way your gearbox in Cumbernauld will shift with more purpose and less slip.