Floor Leveling Kit

This kit applies to all GMC Motorhome models from 1973 to 1978. It's purpose is to reverse the sag in the floor put there by gravity and age. The factory installed aluminum frame beams that are positioned perpendicularly along the chassis (under the floorboards) have developed a frown as a result of the cantilever weight of the overhead body repeatably pounding outboard of the chassis rails, that ended up warping the floorboards upwards in the middle and downwards on the ends. Bulkheads, cabinets and doors stopped closing correctly. Stuff began creaking a little bit, and then a lot. Maybe a few really rough railroad tracks or curbs. These are the reasons this kit was created. It seems that for the first 3 years ('73-'76), frame support positions, contours, and fastening methods changed from year to year until they felt confident. Finally, in 1976, it seems they settled on a stable and robust enough frame structure that stayed with the subsequent coaches. Predominantly, this problem affects the longer 26' models more than the 23', but it really is area/mileage specific to determine how much flexing the frame has endured, because some 23' owners have experienced the same bowing. After ~50 years, anything can happen.

No interior components need to be disassembled or removed for this installation. Everything is done from underneath the coach. I will advise you that this is not necessarily an “easy” kit to install. There’s a good bit of labor involved, but by that same token, it's not the hardest project you've ever tackled, either. Taking the time to understand/identify the problem, how to install the fix, perhaps teaming up with a couple friends, and going through the effort, it will give you the mechanical advantage and the leverage you need to correct a ~50 year old problem. Once completed, it will turn out to be extremely effective and quite permanent, albeit counter intuitive. Through your effort to relieve some of the body weight off of the frame with the jacks (simultaneously), these gussets can be leveraged into position to prevent the floorboards and straps from sagging back down to their usual “memorized” position. These brackets force the bowed ends to return towards the same position as the factory had intended, because these gussets are directly underneath the vertical aluminum beams supporting the roof where the effect of these gussets will do the most benefit. At this time, you might want to tackle body pad replacement, since the weight of that side is temporarily shifted off of the frame. It would make that separate project a whole lot easier. But it’s not necessary for this project.