Body / Tub Alignment?

I am welding in a new floorboard and hat channels on the driver's side of a '67 CJ-5.

Are there any reference measurements to get the 'bolt-down hole' correctly aligned?

I'd prefer not have to place the tub back on the frame...

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On the two CJs I've done in recent years, I have always used vice-grips and Clekos to hold floors, rockers, and channels close to final positions, then I always set the tub on the chassis with some 1/4" wood shims between the mounting points and the tub. With everything settled into place and adjusted, I start to rosette weld things into place. This makes sure everything lines up and sits square. I start by squaring the tub with the rear crossmember, then work foreward.
One of those was sombody else's project they welded together, and found the tub was twisted more than 1 1/2" when sitting on the frame. I could fit a 2x4 under some of the mounting pads, when others were touching. He swore the frame was twisted, but it wasn't. I had to cut most of the new panels loose again and rework it all again. More than twice the work!
-Donny

 

Thanks!

 

When I made my new floor I lined up the tub on the rear cross member where there is four mounts. I then took a 1/2" bolt and drilled a 1/8" hole in the middle of it. I put the 1/2" bolt through the frame brackets and drilled a pilot hole through the new tub hat channels. You might consider making tubes to weld through the hat channels so they don't collapse when you tighten the bolts through the floor. I hope this helps, Good Luck, Rick

 

Something else to consider JJ is on mine I welded 1"x1" box tubing around the body at the rockers and tied into the hat channels and across the trans hump to make it more ridged. Just a thought, it beefs up the rockers and makes the body tub stronger. I also put 1"x1" angle on the box sides inside the wheel wells from the riser to the back of the box, mine was a little rusty that reinforced it. Just a suggestion, not trying to tell you what to do all the work you are doing is nice, once you paint it you won't want to do it again. I filled in behind the tires to keep mud from building up around the tail lights. Good Luck