Free Shipping when you order a pair! Rubicon owners, that's you!
Poison Spyder Bombshell Diff Covers are designed to protect your gears, lockers and diff cover bolts from the most punishing rocks and trail hazards. The stock covers your Jeep came with are weak, stamped sheetmetal. Even a moderate tap with a rock can cave it in against your ring gear, causing potential damage to the gears, locker and carrier bearings, not to mention a difficult, messy trail fix. Even more common, though less catastrophic, is "peel back" that can occur when sliding over a rock causes the lip of the cover to peel up, allowing your gear oil to drain causing a hazard for both your Jeep and the environment. The Bombshell Diff Cover is your best insurance against each of these hazards.
The newly redesigned Dana 44 Bombshell differential cover is cast from highly ductile nodular iron—the same material drag racing differential housings are cast from to handle thousands of horsepower. The design of the Bombshell incorporates recesses to protect the diff cover bolt heads from trail damage, while the profile of the Bombshell acts as a ramp to help slide your Jeep up and over the most troublesome pumpkin-eaters. The ramp profile also results in an extremely thick&up to 1" thick—cross-section around the bolt ring, where contact with the rocks is most likely. Throughout the rest of its cross-section the Bombshell is the thickest cast differential cover on the market, from 7/16" to a brutal 1/2" thick at the outermost surface.
Installing the Bombshell is fast and easy. The sealing surface has been CNC machined flat for a perfect seal. Poison Spyder provides a tube of silicon sealant and new Grade 8 hardware so you'll have everything you need except for tools and gear oil.
Bombshells are shipped either bare so that you may powder coat or paint to suit your own preference, or powder coated semi-gloss black.
Features & Benefits
At Poison Spyder we strive to build superior features into every aspect of each product we make. Every feature has a reason for being included in the design. Here are a list of the most important of these features, along with an explanation of the benefits of each. Consider these important factors when shopping for products, and compare the competition to Poison Spyder's features and benefits!
|High Ductile Nodular Iron||This is the same material high stress items like drag racing rear end cases are made of—the famous for "N" 9" gear cases are nodular iron. High ductility means that this material is less likely to break on impacts compared to more brittle materials such as normal cast iron.|
|Ramp Profile||The profile of the Bombshell slants continuously toward the outside edge of the bolt ring, in effect a "ramp" that helps the vehicle slide up and over rocks rather than snagging on them. Some competing diff covers curve inward to the inside edge of the bolt ring, creating a step or ledge around the outside edge of the cover that can more easily snag on rocks, impeding forward progress. The ramp profile also results in an extremely thick outer edge, around the bolt ring. At up to 1" thick, this extra material is absolute protection agains "peel back"|
|Peel Back Protection||The ramp profile of the Bombshell™ also results in an extremely thick outer edge, around the bolt ring. At up to 1" thick, this extra material is absolute protection agains "peel back"—the condition that can happen when sliding over a rock in the reverse direction (or forward, in the case of the rear diff), when the rock wants to grab the lip of the cover and peel it back, draining your oil and leaving your gears high and dry.|
|Extra Thick Throughout||The Bombshell™ cover is the thickest cast differential cover on the market, ranging from 7/16" thick to over 1/2" thick (not counting the bolt ring area, which goes much thicker). This thickness is your best protection against the rocks caving it in and damaging your internal differential components.|
|CNC Machined Mount Surface||The mounting surface of the Bombshell™ has been CNC machined flat for a positive seal, even without using a gasket! An effective, leak-free installation may be made using just the provided silicon sealant.|
|Raised Fill Hole||The Bombshell™'s fill hole is higher up than stock, for a couple of reasons. First, it allows those who have rotated their axle housings to correct pinion angle or castor, to still use the correct amount of fluid. Next, it allows those who wish to intentionally over-fill to do so (those who have routed their breather lines up higher and want to run extra fluid). Poison Spyder provides a flush profile internal-hex fill plug.|
|Raised Spyder Design||The raised Spyder design on the Bombshell&trad; Diff Cover identifies it as a Poison Spyder product, with the top notch quality and backing that comes along with it. But its more than just a cosmetic feature—the raised portions of the Spyder logo push the thickness of the Bombshell™ up to an outrageous 1/2" thick! The Spyder also provides many opportunities for customizing, as owners can choose to paint the Spyder body color—or any other contrasting color—or black it out and highlight the rest of the cover.|
|Complete Kit||The Poison Spyder Bombshell™ comes as a complete kit, with everything you need to install it except for tools and gear oil. Quality Grade 8 bolts and washers are provided, as well as high grade silicon sealant. The machined mounting surface of the Bombshell™ allows for a gasket-less install using just sealant.|
Q: How much gear oil do I use with this cover?
A: The Bombshell is designed to use the same amount of gear oil as your stock cover. Please consult your vehicle's owners' manual to determine the correct amount of oil to use, as the amount may differ depending on equipment. For example, most Dana 44's with open differentials take 2 quarts of fluid, while those with the Jeep Rubicon electric locker typically take around 1.3 quarts. Just remember that the fill hole on the Bombshell is NOT placed at the full level, so do not rely on it as the full level indicator. It is intentionally placed higher than the fill hole on the stock cover, for those owners who have either tilted their pinion upward and/or would like to intentionally over-fill their diff fluid.
Q: What brand or weight of gear oil should I use?
A: Different differentials and lockers require different grades of oil. We will defer to your vehicle or locker manufacturer's reccomendation of what oil to use. Consult your owners manuals or call the manufacturer.
Q: Do I need to use a differential cover gasket?
A: With the machined mating surface of the Bombshell, the use of a gasket is optional. It will seal properly with only a bead of silicone sealant, if correctly applied. That's why we include a tube of sealant, making this a complete kit. Alternatively you may use a gasket if you prefer.
Q: Will the Bombshell work with my aftermarket suspension system?
A: Poison Spyder Bombshell Diff Covers are not compatible with some aftermarket suspension systems whose track bar mounts or other components attach to the diff cover bolts, such as those manufactured by Skyjacker and Full Traction. The recessed bolt head design of the Bombshell interferes with these systems.
It's a crowded market with a lot of manufacturers competing to earn your business. Here we've assembled a chart with a few of the key competing products in this product category, to assist with your shopping. We've tried to make sure this information is as accurate as possible, but if you spot an inaccuracy on this chart please let us know at email@example.com.
|MFG & Prod Name||Base Price||Material||Thickness||Bolt Recess||Ramp Profile||Items Incl.||Powder Coat|
|PSC Bombshell||$119.00||Nodular Iron||7/16 to 1/2"||Yes||Yes||Gr 8 bolts, silicon sealant||OPT +$10|
|Riddler||$110.00||Ductile Iron||5/16"||Yes||Yes||Gr 8 bolts, silicon sealant||Info N/A|
|Solid Axle||$75.00||Nodular Iron||Info N/A||No||No||Hardware, sealant||Standard|
|ARB||$185.00||Nodular Iron||Info N/A||No||No||Info N/A||Standard (red)|
|Trail Defense||$109.00||Nodular Iron||Info N/A||Yes||No||Gr 8 bolts, gasket||Standard (black)|
|Body Armor||$132.00||Ductile Steel||7/16"||No||No||Hardware included||Info N/A|
|Crane||$179.00||Chromoly Steel||Info N/A||Yes||Yes||Gr 8 bolts, silicon sealant||Standard (green)|
|Alloy USA||$109.00||Cast Steel||3/8"||No||No||Hardware included||Standard||