1. Question Broken bolts on CJ7 transmission crossmember

    On the driver side of the transmission crossmember on my 79 CJ7, there are 3 bolts holding it to the frame. 2 of the bolts are broken off (I'm assuming to nuts welded inside the frame).

    I'd like to repair the bolts without removing the crossmember.

    Anyone have suggestions / experience repairing without taking the entire jeep apart and without using a welder ?

    I'm thinking of these options: (1) drilling through the center of the broken bolt and retapping (2) drilling for the next larger bolt and tapping (3) drilling through the broken bolt, continuing the hole through the top of frame and putting in a through bolt with a nut/washer on top of the frame.

    Any thoughts ?

  2. #2
    Join Date
    Aug 2009
    Location
    Evergreen,Colorado
    Posts
    1,520

    Re: Broken bolts on CJ7 transmission crossmember

    79 pretty sure are just nuts and bolts, get a few grade 8s and be on your way
    ALL I OWN ARE JEEPS!

    54CJ3B ,76DJ5RHD , 81DJ5RHD, 88XJ , (It's)93XJRHD(Alive), 06KJ ,

  3. #3

    Re: Broken bolts on CJ7 transmission crossmember

    Quote Originally Posted by peterblesi View Post
    On the driver side of the transmission crossmember on my 79 CJ7, there are 3 bolts holding it to the frame. 2 of the bolts are broken off (I'm assuming to nuts welded inside the frame).

    I'd like to repair the bolts without removing the crossmember.

    Anyone have suggestions / experience repairing without taking the entire jeep apart and without using a welder ?

    I'm thinking of these options: (1) drilling through the center of the broken bolt and retapping (2) drilling for the next larger bolt and tapping (3) drilling through the broken bolt, continuing the hole through the top of frame and putting in a through bolt with a nut/washer on top of the frame.

    Any thoughts ?

    There are nuts inside the frame that are tack welded to the inside of the frame before the two halves of the frame were welded together. If your bolts are broken off and not turning freely you are ahead of the game; it is when the tack welds on the nuts break free that you have to open the frame to re-secure the nuts or add a second nut to tighten the bolt. Access is best done with a hole saw.

    If the bolts are broken off then the bolts are rusted to the nut. When faces with this problem I drill out the broken bolt, re-tap the hole, and pop in a fresh bolt. The new bolt can be smaller, equal, or larger than the original depending upon what you have to work with. I also always upgrade to a grade 8 bolt. No need to remove the cross member/skid plate that way either.
    Last edited by Saddle Tramp; 09-04-2010 at 11:49 PM. Reason: spelling

  4. #4
    Join Date
    Nov 2006
    Location
    Hanford California
    Posts
    13

    Re: Broken bolts on CJ7 transmission crossmember

    I have had the same problem on a couple of my CJ's and one recently on my YJ. I made a "C" channel that fit around my frames, drilled large enough holes for a 1/2-13 nut to fit in the frame channel, welded nuts to the inside of the "C" channel and through bolted the channel to the frame. That way if I ever have a problem I can repair it. If you don't want to remove the cross member the best bet is to drill through the old bolt with three different diameter bits, smaller to larger and re-tap the threads.

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