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I am looking at doing an LQ4 (6.0L) - 4L80 - Awd (NP149)-76mm TURBO setup in a 95-99 2 door Tahoe. Should make 900ish HP, and be capable of 9 sec passes. I've been told that the GMT400 frame is inferior to the gmt800 and that it needs to be 'boxed' for high hp builds. Any input, advice...