Can anyone help out with a solution to this weird behaviour with Wheel Colliders?
Gravity is set as normal. Using 5.3.4f1
make sure you put a box collider on your car body.
Thank you James. Adding a box collider fixed this. 
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np. caught me out a couple of times
(one time it nearly drove me insane because my car script was working perfectly, put it on a new car and it went mental)
There’s a good automatigical wheel collider script in my sig as well if you need… inspiration
Thanks James, I’ll take a look at that.