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  #1  
Old 12-04-2019, 10:57 PM
Dave Jeeper Dave Jeeper is offline
232 I6
 
Join Date: Sep 08, 2019
Location: Denver, CO
Posts: 54
Broken Rear Body Mount Bolts - Help Please

I replaced all of the body mounts on my 89 Grand Wagoneer. The rear most bolts on the driver and passenger side were rusted to the captured nuts and the bolts broke off in the middle of the bolt. I stuck the new poly bushings in there and they are being held in place by the remaining stubs of the broken bolts. When I go over big bumps, there is a really loud noise in the back, presumably from the body raising up a little and smacking back down on the frame (it sounds too loud to be my sub-woofer box and I have not gotten around to removing the sub to verify).


I want to replace the bolts but I have not been able to identify where I would drill out the floor to get to the captured nuts. Is the tailgate in the way? Does the tailgate have to be removed to do this or can it just be folded down and the carpet lifted up?


Is there a way to put bolts between [the channel on the underside of the rear of the body] and [the frame rear crossmember just inboard of the main frame rails] to hold the body down to the frame in the rear? Would that involve drilling out the floor or can a nut with a welded flag be inserted into the channel somehow?


Any photos would be greatly appreciated.


David
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  #2  
Old 12-04-2019, 11:08 PM
SJTD SJTD is offline
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Join Date: Apr 26, 2012
Location: Lompoc and Sunland, CA
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Had to drill out those bolts on mine. I used a hole saw to drill the floor then drilled through the bolts. Shouldn't have to remove the tailgate.

I'll try to get a picher tomorrow.

Usually the captive nuts spin before the bolts break.
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  #3  
Old 12-04-2019, 11:10 PM
Dave Jeeper Dave Jeeper is offline
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That's encouraging, thanks. Looking forward to pics. If you are able to get one of the floor where you drilled, it would be greatly appreciated.


David
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  #4  
Old 12-04-2019, 11:25 PM
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Full Size Jeeper Full Size Jeeper is offline
304 AMC
 
Join Date: Jul 20, 2014
Location: Mandeville Louisiana
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This is on a 78 Wagoneer.
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1978 Wagoneer

401/turbo 400 trans. Quadra-Trac BW1339 (with Low) 4" Rusty's lift with 31" Summit Mud Dawgs

Mods:
Fuel Tank, Red Holley Fuel Pump, Razor Grill (profile pic out dated), Rebuilt steering box
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  #5  
Old 12-04-2019, 11:25 PM
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Full Size Jeeper Full Size Jeeper is offline
304 AMC
 
Join Date: Jul 20, 2014
Location: Mandeville Louisiana
Posts: 2,068
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1978 Wagoneer

401/turbo 400 trans. Quadra-Trac BW1339 (with Low) 4" Rusty's lift with 31" Summit Mud Dawgs

Mods:
Fuel Tank, Red Holley Fuel Pump, Razor Grill (profile pic out dated), Rebuilt steering box
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  #6  
Old 12-04-2019, 11:27 PM
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Full Size Jeeper Full Size Jeeper is offline
304 AMC
 
Join Date: Jul 20, 2014
Location: Mandeville Louisiana
Posts: 2,068
Cage for nut.
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1978 Wagoneer

401/turbo 400 trans. Quadra-Trac BW1339 (with Low) 4" Rusty's lift with 31" Summit Mud Dawgs

Mods:
Fuel Tank, Red Holley Fuel Pump, Razor Grill (profile pic out dated), Rebuilt steering box
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  #7  
Old 12-04-2019, 11:28 PM
Dave Jeeper Dave Jeeper is offline
232 I6
 
Join Date: Sep 08, 2019
Location: Denver, CO
Posts: 54
Thanks, that looks like it can be done with the tailgate in place.
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  #8  
Old 12-04-2019, 11:31 PM
Dave Jeeper Dave Jeeper is offline
232 I6
 
Join Date: Sep 08, 2019
Location: Denver, CO
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I'm not able to re-use the original square nuts, so I will probably use a regular nut on top and a socket during installation, or weld a flag to the nut before inserting so the flag will hit the side of the channel and keep the nut from from spinning.
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  #9  
Old 12-04-2019, 11:40 PM
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Full Size Jeeper Full Size Jeeper is offline
304 AMC
 
Join Date: Jul 20, 2014
Location: Mandeville Louisiana
Posts: 2,068
I cut some flat bar into squares and drilled and tapped.
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1978 Wagoneer

401/turbo 400 trans. Quadra-Trac BW1339 (with Low) 4" Rusty's lift with 31" Summit Mud Dawgs

Mods:
Fuel Tank, Red Holley Fuel Pump, Razor Grill (profile pic out dated), Rebuilt steering box
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  #10  
Old 12-06-2019, 06:54 AM
threepiece threepiece is offline
350 Buick
 
Join Date: Sep 17, 2005
Location: Farmington Hills Mi.
Posts: 1,222
Quote:
Originally Posted by Dave Jeeper
I replaced all of the body mounts on my 89 Grand Wagoneer. The rear most bolts on the driver and passenger side were rusted to the captured nuts and the bolts broke off in the middle of the bolt. I stuck the new poly bushings in there and they are being held in place by the remaining stubs of the broken bolts. When I go over big bumps, there is a really loud noise in the back, presumably from the body raising up a little and smacking back down on the frame (it sounds too loud to be my sub-woofer box and I have not gotten around to removing the sub to verify).


I want to replace the bolts but I have not been able to identify where I would drill out the floor to get to the captured nuts. Is the tailgate in the way? Does the tailgate have to be removed to do this or can it just be folded down and the carpet lifted up?


Is there a way to put bolts between [the channel on the underside of the rear of the body] and [the frame rear crossmember just inboard of the main frame rails] to hold the body down to the frame in the rear? Would that involve drilling out the floor or can a nut with a welded flag be inserted into the channel somehow?


Any photos would be greatly appreciated.


David
You may be able to connect locking pliers to the remaining bolt/stud after jacking up the body some. I recommend using curved jaw pliers as opposed to strait jaw and apply heat if possible.
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  #11  
Old 12-06-2019, 08:53 AM
Dave Jeeper Dave Jeeper is offline
232 I6
 
Join Date: Sep 08, 2019
Location: Denver, CO
Posts: 54
The rear mount support metal and the rear mount bolts are still present, but have rusted severely due to all the road salt that is thrown up onto them by the rear wheels. I don't think that it is worth trying to save the rear nuts. It will be easier to use an air hammer to break the retaining cage, then replace the bolt and nut. It seems that it is possible to drill out the floor above the nuts without removing the rear hatch, based on the replies to this post.


David
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