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Gear Ratio Help


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What would be the best set up for a daily driven truck. I have a 74 620 (automatic version) with a 4.625:1 rear end and the ka24de engine and 5spd tranny in my truck, the 240sx has a stock 4.08:1. The options Im considering are from a 79 620 which has a 4.11 which is close to a stock 240sx, or a 720 with a 3.889. I read this thread http://forum.ratsun.net/showthread.php?t=13600&highlight=720+gear+ratio which was helpful. I read on some 240sx forums that some guys/gals swap to 4.6 or to 3.8 and they both swear that it was an improvement over stock. Any input appreciated.

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