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4l80 gbody trans crossmember

 
Old 12-10-2018, 12:29 PM
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Default 4l80 gbody trans crossmember

I built a crossmember out of 1/4. Angle iron scraps and layered 1/4 by 1 in flat stock now that its together im not sure it will be strong enough im gonna add more steel to the center once im positive on the angle of the trans( still gonna lower the car a lil bit) im running a 5.3 with 15 psi for now... Do u guys think it will hold up?
Also my father says that if i bolt it to the bottom of the frame on the ends it will rip out he says it goes above the lip i made off my frame(i boxed the frame in and welded angle iron to the inside to bolt it to from under side) just looking for some outside input
Attached Thumbnails 4l80 gbody trans crossmember-20181210_131051.jpg   4l80 gbody trans crossmember-20181210_131107.jpg   4l80 gbody trans crossmember-20181210_131116.jpg  
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Old 12-10-2018, 12:32 PM
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The right side in the pic will not support any kind of weight. Look at other crossmembers and see how they are made, usually out of tubing or at least channel iron.
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Old 12-10-2018, 02:53 PM
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It will sag very quickly, if not instantly.

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Old 12-10-2018, 03:43 PM
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Ok my first idea was to use rectangle tube and build one but it seemed like it was gonna sit lower under the car and be visable from the side.
I went online and started looking for ideas and found a few gforce ones that had good reviews... But i see they are probably at least a half inch thick or more around those Bends.what if i welded more steel on it doubled the corners put small kickers in the corners on all the inside corners..til the point it's 5/8 thick or more in every spot? does welding more layers of Steel even help?maybe made a layer that runs under the exhaust.
Or just ditch the cutout ? and run the exhaust out the hood lol.
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Old 12-10-2018, 03:55 PM
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Originally Posted by Matt Lenont View Post
Ok my first idea was to use rectangle tube and build one but it seemed like it was gonna sit lower under the car and be visable from the side.
I went online and started looking for ideas and found a few gforce ones that had good reviews... But i see they are probably at least a half inch thick or more around those Bends.what if i welded more steel on it doubled the corners put small kickers in the corners on all the inside corners..til the point it's 5/8 thick or more in every spot? does welding more layers of Steel even help?maybe made a layer that runs under the exhaust.
Or just ditch the cutout ? and run the exhaust out the hood lol.
You could do just what you proposed...double up the thickness of the top plane of the pass through section and then gusset all the corners. Your dad gave you good advice about not mounting it to the bottom surface of the frame rails, I would highly advise against doing that also.
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Old 12-10-2018, 05:42 PM
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Thanks for the replies im gonna work on it tomorrow and repost my progress or solution...
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Old 01-11-2019, 05:31 PM
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im about to buy some round tubing to make one myself
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Old 01-11-2019, 09:04 PM
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I still haven't finished mine its way thicker and has a few gussets in it. But its been hard to get sum time to work on it.i started a new job and been putting in a lot of hrs. hopefully Sunday im gonna try n get this trans off my jack lol
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Old 01-11-2019, 09:25 PM
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Why not modify the stock crossmember ?
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Old 01-12-2019, 06:02 AM
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I bought the car as a roller without one
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