The 3 1/2" (88.9mm) Spider 9 Ultimate Housing steps up the level of performance and looks of today's off-road machines. Building on the platform of our top placing Pro Series Housing, our latest Ultimate Housing is stronger (ARP Studs, 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 for many of the Pro Series Housing benefits, at a fraction of the price, the Spider 9 Ultimate Housing is the perfect solution.

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

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.

The all-new 4" (101.6mm) Pro Series Housing is our strongest Spider 9 housing yet, delivering a level of quality and performance that is untouched in the industry. Building on the platform of our original Spider 9 housing, the 4" (101.6mm) Pro Series Housing comes complete with 4" (101.6mm) using a Chromoly construction and OD x 1/4" wall heat treated tubes, coupled with a wider shell that's now internally gusseted. Off-the-shelf at 68" (1727.2mm) OAL, working with both standard and mid-engine setups, the 4" (101.6mm) Pro Series Housing is as versatile as it is tough.

This is the same rear housing that has powered Loren Healy's Red Dragon Ultra4 racer to record-breaking 1st place finishes. If you're looking to take your racing to an all-new level, this is the housing for you.

Every 4" (101.6mm) Pro Series Housing comes with third member ARP studs & nylock hex nuts. Fill bungs and caps are sold separately.

The Spidertrax High Performance Inboard Oil Seal Kit is the perfect solution for sealing up your Spider 9 housing. We start with billet 6061T6 and machine a fully rebuildable seal housing that accommodates three external o-rings and two high performance axle shaft seals (both o-rings & seals are pre-installed). With up to five total sealing surfaces, this kit ensures oil stays where it belongs, inside the housing. Seal is designed to install on the inboard side of your Spider 9 (installs near your diff).

Please note, this Inboard Double Seal works with ALL Spider 9 housings LESS our legacy 3" 76.2mm OD x 3/8" 9.5mm wall Spider 9. If you are in need of an inboard seal for this legacy housing, please click on the Contact Us tab located on the bottom of this page and we'll be happy to help you out.

This is the same seal housing as the 40-45 spline version but with a smaller seal (SLIINSERT).

The Spidertrax Inboard Seal Housing Rebuild Kit is designed to completely rebuild your Spidertrax in-board seal housings. Each rebuild kit comes with 2 seal inserts, 3 o-rings, and a new seal retaining set screw.

Please note, this rebuild kit is designed specifically for Spidertrax model no. SLI212D.

Designed around NASCAR technology, this stretchy Seals-It brand seal insert performs like no other seal around. This one insert will work with shafts of diameters up to 40 spline and will keep oil where it belongs, inside your housing.

These seal inserts are designed to be installed in the Spidertrax High Performance Oil Seal Kit.

The Spidertrax High Performance Outboard Oil Seal Kit provides an easy and clean solution for installing seals on the outboard side of your Spider 9 housing (wheel side). Each kit comes complete with steel seal housing and two rubber seal inserts. Steel seal housing is designed to be welded in place.

The Spidertrax High Performance Outboard Oil Seal Kit provides an easy and clean solution for installing seals on the outboard side of your Spider 9 housing (wheel side). Each kit comes complete with steel seal housing and two rubber seal inserts. Steel seal housing is designed to be welded in place.

Inboard Seal
for 40-45 Spline Shafts

The Spidertrax High Performance Inboard Oil Seal Kit is the perfect solution for sealing up your Spider 9 housing. We start with billet 6061T6 and machine a fully rebuildable seal housing that accommodates three external o-rings and two high performance axle shaft seals (both o-rings & seals are pre-installed). With up to five total sealing surfaces, this kit ensures oil stays where it belongs, inside the housing. Seal is designed to install on the inboard side of your Spider 9 (installs near your diff).

This is the same seal housing as the 35-40 spline version but with a larger seal (SLI120).