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Why is there a change in noise when I switch from two to four-wheel-drive in my Holden Colorado 2013?
A minor increase in noise when shifting to four-wheel-drive is quite a normal thing to happen. By selecting four-wheel-drive, you’re suddenly engaging the transfer-case output shaft, the front differential and the front driveshafts. So, fundamentally, there’s a lot more mechanical stuff happening, and that’s probably what you’re hearing.
But the change in noise shouldn’t be a huge one, nor should it involve a high-volume noise of any kind. If there’s something screeching, grinding or knocking when the vehicle is in four-wheel-drive, then there’s probably something wrong with the driveline. If the noises are loud or nasty, then you need to have the vehicle inspected to find the cause and fix it before it causes more damage.
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