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NEVER weld in sub frame connectors on a 2 post. Never.....

The load must distributed equally across the structure by either, as you stated, using a drive-on ramp lift or leveling and cross-squaring the rails and using 4 STURDY stands.

Once correctly installed you'll notice the difference. They really tighten-up the unibody.

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What troubles do you expect to encounter if you do it on the lift as he mentioned?


If you put the car up on the lift and the doors open and close properly I would say you should be fine doing it on your lift. I think it really depends on where you place the lift arms as to how much body flex you'll encounter. I did mine on the lift and the door alignment and gaps couldn't be better. They open and close just fine.
I did make sure the car, when lifted, was perfectly level before any welding took place.