final gearing question... i promise

so now that i need new ring and pinion in the front becasue thr 4.56s i bought are munched now i am trying to figure out how to make 4.56 gears work with a case for 3.54 and under....what do i buy to make this work??? can i just buy a case for 3.73 and up? i was told the 4.56's will work on a dana 35 casing from oem but not on the front dana 30?
thanks once again

The D35 will work(assuming you have 3.55's now) but youll need a new carrier for the D30!