The 3.77 R&P will be a nice addition, if they weren't so damned expensive I'd probably switch to a 3.77 in both cars, the '74 definitely. When I purchased the GT5 from Coz the ZF was with Quella being rebuilt so I called and had him drop in the tall 5th while it was apart, still has the 4.22 rear end, but makes for a much better cruising 5th gear.
All the best,
Julian
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