727 or 904?

Cudafever said

340, 4.56 gears and only a 2500 stall will not do a burnout of the water box with out starting in 1st! But like rusty said, start in 1st shifting immediately into 2nt before burning out of the water box edge.
My 408 has no problem with starting out in 2nt gear with same converter.

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You have completely missed what I said about the traction issue.
That is another way that the sprague can fail. The tires grip, ungrip and then regrip again.This can shock the sprague and fail it. Nothing to do with the burnout. That is why some trans brake makers believe you should have low band apply to protect the sprague.