Re: 14 bolts
with a semi floater if the axle breaks you loose a tire as the axle is held in with a c clip at the diff side. On a full floater you can remove the entire axle just by unbolting it from the hub and sliding it out, the hub/bearings/brakes/tire still are secured and will roll if need be.
The SF 14 bolt comes in both 6 and 8 lug versions while FF only comes in 8 lug. If keeping the 6 lug I would swap in the SF as it is much stronger than the factory 12 bolt
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