This mod has been tested by SGMODS.
Spintires Mudrunner – T-Shift Gearbox V1.0
T-Shift Gearbox mod for Spintires Mudrunner.
Installation: copy Config.xml and TattooGearBox.zip to the game folder agreeing to replace.
Config.xml can not be copied if you manually add a line
<MediaPath DoPrepend=”true” Path=”TattooGearBox.zip” />
Credit(s):TatooSpintires Mudrunner – T-Shift Gearbox V1.0 Download File