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Old 09-13-2005, 10:40 PM
Ricky Rocket's Avatar
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sub frame attachment

From what I have seen on this site and other places, there seem to be two basic ways to attach a sub frame to the original frame. One method is to slide the sub frame either inside or outside along side of the original frame rails and weld into place. The other method seems to square off the original frame and sub frame and butt the two together, then reinforce with other braces and welds.

Is there any advantages or disadvantages with either method or is it just personal preference. Does it matter which original frame and type of sub frame combination you use?

I am just trying to learn as much as possible about this before I start my project.

Thanks for you input,
Rick

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Old 09-14-2005, 04:50 PM
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i think the main advantage with lapping the frames is that you can move each piece around and get it where you want it before you weld. if you butt weld then you have to make sure that each piece is squared off exactly on each side so that the pieces meet up properly.

as far as welding, each method will work good. just remember that the bigger the area you are welding, the stronger the joint will be.

after that it just comes down to esthetics.

JB
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Old 09-14-2005, 09:28 PM
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Really depends on the sizes of the two frames you are joining. If they slide together, great. If you have to butt and fish plate them, that's OK too. If your welds are sound with 100% penetration, there is no advantage to either, strength-wise.
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Old 09-18-2005, 09:06 PM
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Sub frame attachment

The '84 cutlass sub frame that I am considering really widens out just behind the suspension so if I use this I will have to cut the sub close to the upper and lower A arms so it matches closer to the width of my original frame. Does it make any difference how close to the donor suspension I splice it at? In other words, how far away from the suspension can I put the seam?

Thanks,
Rick
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Old 09-18-2005, 10:59 PM
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The mid 70s Monte Carlo which is my favorite sub frame wides too. My solution is to simply cut out wedges to narrow it to the width of the receptor frame. See photos in my Journal, especially Monte Carlo clip for '55-'59 Chev PU - 2
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