4l80 behind G3

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It takes more than a little cutting to get a 4l80e in an a-body. Jim, the fab guy that did mine, started out using a 727/plastic 2G HEMI block and a motor/mid plate. He positioned the trans using the oe mount/cross member. Mocked the motor up off of it, mounting the motor/mid plate. Pulled the 727 and started cutting.

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When he got done building a new tunnel he also had to tweak the throttle a bit to clear the tunnel....

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Here comes the problem, sort of. You are left with really nothing to prevent the t-bar's from twisting as they do there thing. In my case, I have a cage with the a-pillar mounts welded to the rockers, right in the area where that one brace goes from the rocker to the front frame stub. Our car also has a tube under the dash as well as above the windshield. Also will have a motor/mid plate which goes along ways to triangulating things. I also have a Dillinger lower radiator support. I think if you were to just cut a car open like mine is, and not replace the support that is now missing by doing so you will be asking for trouble. However, a simple solution would be to fab up something similar to this...

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Which I found at this thread.....

http://www.forabodiesonly.com/mopar/showthread.php?t=183871

I feel it would eliminate any & all flexing that would take place by removing the oe shaped sheetmetal cross member that runs over the trans. Of course the 80's mount is a few inches behind this area, you can see it's position in my one picture, it is the round tube. Of course this assumes that you have subframe connectors present. Hope this helps....if you have any questions fire away...will do my best to answer them.
I will be losing the torsion bars as I recently purchased a Hemi Denny front end. He uses the oe upper mount for the top of the shock. He supplies braces very similar to what is used in the off road world.
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Couple that with my motor/mid plate & lower radiator support I seriously doubt I will have any flex issues....