Nope,still have a problem
I don't have Windows 8 but maybe there is a conflict between wheel and pedals.
I remember some people who had issues with G25 and G27 because they connected it with the computer, started the computer and windows used it's own drivers.
To get rid of the problems, they had to unconnect their wheels and remove ALL entrys, according to G25 and G27 out of the windows registry. And if it is installed, uninstall the LGS software too.
Then reebot the computer and at first install the LGS Software and during the installation-routine you'll get the message when you may connect the wheel. Then go on with the installation routine and configure the wheel with the LGS software.
If i understood it right, you connect the wheel and the pedals to different USB-ports.
Maybe you can see a conflict in the hardwaremanager.
Or there is a conflict within the windows drivers if they are used for wheel and pedals.
If not, for your problem i would suggest to disconnect wheel and pedals.
Remove all related entrys for both in the registry, uninstall the LGS software, reboot the system, install LGS software, connect only the wheel when told by installation-routine, finish installation and setup the wheel with the LGS software.
Then try to configure the wheel in game.
If it works, leave the game and connect the pedals too and then join the game again to try to configure the pedals.