Originally Posted by SeriesYJ
Is there an axle kit that eliminates the vac system but keeps 27 spline axles?
In short, yes, 10 factory, Alloy USA, and others offer some chromos in 27 spline.
Or if you're looking for something a little cheaper, swap to stock TJ/XJ shafts. Can be found in many junkyards. I use http://www.car-part.com
to search for parts in local yards.
Either way will elimitate the 2-piece p-side design (and thus the vac system) and gives you the larger 297 joint. The chromoly shafts will be stronger (the shaft itself, not the joint which is the same), but cost more. I'm not sure what seal setup the chormo kits use, but with the TJ/XJ shafts you have to change to a napa 11800 seal in the passenger axle tube @ the differential.
Run a search on here for TJ shaft swap or similar. Tons of info already posted on this type of swap.