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From what I've been told the 4.8" br bolt pattern is too small to fit the od trans, so either the bh has to be bored or the br turned down. I just don't know if the 4.3" bh can be opened up far enough.

it depends on what 4.8 retainer you are talking about. The 4.8 for the small 307 bearing will not fit the overdrive trans but the 4.8 retainer for 308 bearing will fit the overdrive trans or you can just cut the 5.125 overdrive retainer down to 4.806.