I've build this model during the summer in the original setup. Worked fine. Then discovered this topic and read about the steering mod. So ordered those parts and have now rebuild the Volvo from the ground up with the Efferman steering mod. The steering mod works great but I have a problem now with the driving. It drives forward without problems, but it doesn't want to drive reverse. It seems to get stuck then. I'm thinking that maybe a cable somewhere is to close to a gear somewhere or so. Need to check it out tonight. If anyone has other ideas where I should lookout for, then please let me know.