The 3 1/2" (88.9mm) Spider 9 Pro Series Housing delivers a level of quality and performance that surpasses the industry's highest standards. Building on the platform of our original award-winning Spider 9 housing, today's Pro Series Housing is stronger (3 1/2" (88.9mm) using a Chromoly construction and OD heat-treated tubes, internal shell gussets, accepts 9" (228.6mm) and 10" (254mm) gears), more versatile (68" (1727.2mm) OAL, works with standard and mid-engine setups), and is just downright sexier (tig welded on outside, machined face). If you're looking to win, look no further than the Pro Series Housing.

Every Pro Series Housing comes with third member ARP studs & nylocks. Fill bungs and caps are sold separately.

Strong
Crafted out of 4130 chromoly steel, now with internal gussets, and as always heat treated 3½" (88.9mm) x ¼" (6.35mm) wall axle tubes. We've also redesigned the faceplate to allow the use of both 9" (228.6mm) & 10" (254mm) gears. Get ready to go fast.

    
Secure
Best to keep those 9" (228.6mm) & 10" (254mm) gears where they belong, inside your Pro Series Housing. That's why we've redesigned the shell to work with ARP studs. No matter how many miles, your third member will always stay tight.

    
Sexy
It's one thing to have the strongest Spider 9 axle ever built, but why not make it the sexiest as well. All Pro Series Housings are tig welded on the outside. Not only does it look great, it ensures the most critical welds are race ready.

    
Complete
All Pro Series Housings are precision machined for genuine ARP third member studs, included with every order. Plus, at 68" (1727.2mm) in length, this off-the-shelf housing works for almost any off-road application. One housing, everything you need.