I recommend taking out two on each side and leaving the others in, but loose. This way, you will be sure the cab don't move with you and make a biotch to get the bolts started. Then jack up a side at the time, put in new ones, drop it back down, start the bolts, but leave them loose. Do the other side the same way.
Dave,
you will need to cut a hole in the floor to get yours out. No other way to do it. Then you can weld the nut back to the floor support, and weld a piece over the hole.
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Mike
1985 Chevy C-10
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