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Awh, the gearboxes were good!! Hope to see them in a future RK Gearboxes mod ;)
Getting the same issue and the RK Gearboxes (12 speed and 7 speed) have dissapeared from all vehicles.
Relating to the AMD Artifacting, I run a R9 Fury X, and have the latest 18.11 drivers, cleared the cache and still get heavy artifacting