From Wikipedia:
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The "MN5" 4T45E is able to handle vehicles up to 4500 lb (2041 kg) GVWR. Final drive ratios include 3.63, 3.29, 3.05, and 3.91. This same transmission is used in the Saturn VUE Green Line hybrid vehicle with the addition of an auxiliary oil pump and hybrid-aware electronics. It is designed for 3.0–3.4 L engines producing up to 205 ft·lbf (278 N·m) of torque.
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You don't have to worry about the 4t45e tranny. It's pretty strong. That link you've got looks interesting, but it would be a pain (and/or lots of $) to install.