I had to replace the VCU since mine was solid. The guide from Ashcroft said to remove the gearbox mount to make room for the VCU to fit, but that looked like more work than my solution, which was to unbolt the crossbeam and knock it down a touch. I since saw many guides which suggest completely removing the crossbeam, which seems like way more work. They are a bastard to refit, so why make yourself that much work?