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Unread 07-21-2013, 11:16 AM   #1
MadMike03159
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1993 YJ Wrangler 
 
Join Date: Apr 2013
Location: Knoxville, Tn
Posts: 21
Body mount nuts move around while threading

Finally got my tub back on my frame the other night, but I ran into a problem trying to thread the body mount bolts. The square nut that they thread into is free to move around up and down which makes it pretty tough to thread. Does this mean I need to replace the hardware; or am I just missing something.

I cut into the enclosed compartment on the rear from underneath the vehicle to find the square nut was not welded, and didn't look like it had ever been welded to the body. There is a slot for it to sit in, but the slot does not prevent it from lifting up and out of place while threading. Anyone have any advice here?

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Unread 07-21-2013, 12:20 PM   #2
Michaelgoesrawr
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1988 YJ Wrangler 
 
Join Date: Nov 2009
Location: Waco, TX
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They are called captive nuts and were attached somehow. They are in your frame for the skid plate too. If you can weld, just tack them back down.
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Unread 07-21-2013, 12:50 PM   #3
kloppk
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1992 YJ Wrangler 
 
Join Date: Oct 2006
Location: , Massachusetts
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The body mount nut plates are designed to "float".
They are held in their approximate position with a sheet metal cage.
They need to float and not be welded into place so they can align when installing the body bolts. (They frame to body alignment is not exact)
Yes - it can be tedious getting the bolts started.
I usually run a tap thru the nut plates to remove excess rust, etc and then grease them.
I also run the bolt threads across a wire wheel and give them a coating of grease before starting them.
Sometimes it helps to start a longer bolt a couple of threads, back it out leaving the nut plate in the correct position. Then gently insert the body bolt without disturbing the position of the nut plate.
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Unread 07-21-2013, 01:22 PM   #4
MadMike03159
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1993 YJ Wrangler 
 
Join Date: Apr 2013
Location: Knoxville, Tn
Posts: 21
Interesting, thanks for the great advice. I'll give that a shot. I was pretty worried when I first noticed this, cutting in and welding all of those nuts would have been a pretty tedious job. And so close to the end of the project too.
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