Originally Posted by adamgraves
so sounds like step one is remove the underbelly and see what i can see... thanks guys. any tricks to the underbelly or is it pretty straight forward?
It is relatively straight forward to remove the belly pan. The center section is riveted to the frame main rails and to the crossmembers. Drill out the rivets far enough forward from the rear to expose the area you need to work on. Once the pan is free you can roll up that portion of the rear section so you can work under there. You don't need to remove the entire rear section of the center belly pan only to repair the rear end seperation problem.
Next would be to remove the lower beltline trim which goes around the bottom edge of the shell. Start at the center of the rear where the two sides meet. Drill out the pop rivets holding this molding to the shell. Remove the molding, this will expose the rivets holding the banana wraps and the side sections of the belly pan to the shell. Drill out these rivets and remove the banana wraps and the side sections of the belly pan.
I'm afraid you probably won't like what you find under there. The insulation will be water logged and infested with mouse poop. You will also be able to inspect more of the frame crossmembers, outriggers and main frame rails for rusting out. You will also be able to see the condition of the floor. More times than not the floor actually rots out from below due to the insulation trapping water against the bottom of the floor.
Is your unit a rear or center bath?
Once you get into it post some pics and tell us what you find. We then can advise further what need sto be done. Like I said before to fix this properly the interior skins need to be removed to get at the bolts inside the walls.