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PCIt is hit or miss when submitting GAI slabs to SGC for crossover grading, especially if you require a minimum grade for the crossover. But the same can be said for trying to crossover PSA or BVG/BGS.
My only negative experience trying to crossover GAI to SGC was with a 1963 Mantle graded GAI 6. I wanted to cross it to SGC but only at the same grade (SGC 80=6), and SGC disagreed. So, I have a nice 1963 Mantle in GAI 6 in the middle of my SGC graded Mantles. Life could be worse.