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Old 08-31-2007, 05:16 PM
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crossmember

hey all i,m modifying my crossmember by cutting out part of it and putting a flat piece of nice thick flat steel over it, i was wondering if it might be okay to use grade 8 bolts instead of welding it in for dual exhaust.

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Old 08-31-2007, 05:57 PM
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I don't know what you are working on, but if your crossmember is no longer than 3 1/2 feet across and is of some type of channel.....(this is total hillbilly engineering....you assume all risk for use of this advice)

Overlap each side of the joint by 8" or a foot, and bolt it with bolts at each end of the joint, (for a total of 4 bolts minimum) you should be ok. Use washers on the side with the thinner metal and use a minimum of 3/8" x 3" for your filler piece on no more than a 1' cutout. More cutout means you need thicker material.. Make sure the load is centered on the new strap, any twisting will make you need a stronger joint .

....and fer a really strong joint wrap it up with some balin' wahr....

Later, mikey
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Old 08-31-2007, 06:31 PM
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What kind of vehicle are you working on? Are you talking about the transmission crossmember or what? Most transmission crossmembers are bolted to the frame.
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Old 08-31-2007, 07:18 PM
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Good point ,Henry...I assumed a trans crossmember. And I assumed that someone welded it in....And I'll continue to assume that it is a trans crossmember...for now..

So, saying all that,


Here is some more,,,if your crossmember is of a tubular material, then a different approach needs to be taken..

If it is tubular you should really use a larger tube, slipping one inside of the other..When you bolt through a tube with a plate on only one side, it will collapse the tube, making the joint loose, and failure will follow. You can however, weld some through tubes into the tube, to keep it from collapsing, that will make it strong again. Or better yet, weld a plate to the tube, then bolt your new patch plate to that. That way the stress isn't on the walls of the tube in such a small area.

Or do it right, and make the whole crossmember drop out.


Later, mikey
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