What rear-end do you have? You won't have to change the rear-end housing, but you *might* have to install a different series carrier (pumpkin). GM rear-end carriers come in 2, 3 and 4 series.
Carrier series to gear ratio correlation is as follows (or so I've been told):
2 = up to 2.90
3 = 3.08 - 3.90
4 = 4.11 & up
HTH
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