The best Ultra4 IFS Housing deserves the best IFS axle shafts. The Spidertrax Series 30 CV 40 Splined 300M Billet IFS Differential Shafts deliver on that need, building on the best IFS technology available today. Sold as an axle shaft pair, complete with bearings, bearing retainer & collar, and seals.
These Series 30 IFS Differential Shafts are designed specifically for a 40 splined spools. Do not use these shafts for other locker types.