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Many EVs Aren’t Legal on Park Service 4WD Roads
(cleantechnica.com)
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this post was submitted on 12 Aug 2024
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[Dormant] Electric Vehicles
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Thank you for this, I was part way through and questioning my sanity.
Though now I'm thoroughly confused as to where my Audi Q7 Quattro stands in the grand scheme of things...
Apparently AWD:
https://www.audinorthlake.com/blog/2017/february/2/is-the-audi-q7-an-all-wheel-drive-or-four-wheel-drive-suv.htm
https://youtu.be/7QbJZ6HYTfc
Generally if there is a question of AWD vs 4WD, the only thing you need to look for as an ability to shift to 4 low. It changes the final drive ratio so all of your gearing is dramatically lower. It’s a capability that requires having a transfer case. Though I’m sure there are some weird exceptions out there of 4WD vehicles that don’t have 4 low, it’s a pretty simple rule of thumb to decide which side a vehicle falls on.
It’s possible to have an AWD vehicle that has a clutch or some other way to disengage two of the drive wheels. So you can have a selectable RWD or AWD. This is different than how a transfer case works though, and does not allow a change in final drive ratio.