After getting input from several people and also measuring 3 sets of my own running boards and 4 truck frames, I averaged out the numbers for each dimension. If you measure on your truck you can be about 1/8" off of these numbers since that seems to be the tolerance GM used... plus or minus 1/8".
Please look this over carefully and then critique it. I want people to argue these numbers because if they are not right, I would want to know sooner than later.
http://devestechnet.com/Images/Projects/RunningBoards/RunningBoards0038lg.jpgI am perplexed that we do not have this information available anywhere. Those frame brackets get bent, running board brackets deteriorate. Who knows why they didn't put it in the FAM. Is there anything else concerning running boards we need? I also have a bunch of pictures concerning running boards here:
http://devestechnet.com/Home/MorePix#runningboardpics
