You mean only the Comp G's were SC'd with drive/driven gear ratio of 1:1? All the SC aka HD transmissions had a 3.29 diff.
King.. what you could do to rebuild while your still driving is have a non hd trans rebuilt with all the upgrades etc, then toss your HD diff and diff cover into it. Presto, insta 3.29 overall ratio because the non hd has the 1:1 ratio