If you are also going to install fresh u-joints on the axle shafts, I'd go with Spicer's 5-760x which is a stronger direct-fit version of the 5-297 than the factory installed. Generally speaking, sealed -joints like the 5-760x are stronger and more durable than u-joints are that have a zerk fitting in the body which means there are grease channels running through the body which weakens it.
Go with Spicer. I 'upgraded' to Synergy last year, and am not happy with the results...less than a year, and already developing play. Yes, they've been lubed regularly, and with Synergy's 'special' grease...
I'll be installing a shiny, new set of Spicer ball joints, tomorrow.
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