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The 3.90 gear will be fine with the 600 Tremec. And yes, there are some folks with issues...but many more with no problems at all. I couldn't recommend either way unless you have it "pro-built." A sure bet would be to get one through a shop who modifies them with some higher-capacity parts. For instance, ProMotion Powertrain adds billet shift forks and blueprints some extra stuff; they faceplate the gearsets instead of the synchros...those transmissions shift fine behind 500hp at 9,000 RPM.
All in all, Tremecs are stronger cases than the G-force modified T5, but at your 400 hp level, the G-force would be fine. The only troubles with those arrive when sustained 600 hp levels are seen.
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" If you can't explain it simply, you don't understand it well enough. " - Albert Einstein
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