Mark Williams Gen 2 Billet High-Strength Chromoly U-Bolt Kit for 1350 U-Joints
This product is a Gen 2 High-Strength U-Bolt Kit developed based on driveshaft torsional endurance testing.
To securely fasten 1350-size universal joints used in components such as 10-inch quick-change rear ends, it employs a clamping structure that prevents cap deformation.
This significantly reduces the risk of needle bearing damage caused by over-tightening.
Features
Compatible with 1350-size U-joints used in 10-inch quick-changes, etc.
High-strength chromoly caps
High-strength stud bolts (rolled threads)
Includes 12-point lightweight double-hex nuts
Uniformly tightens U-joint caps to prevent bearing deformation
Improved durability and reliability
Made in the USA
Specifications
Strap Material: Pre-heat treated chromoly steel
Stud Material: 150K high-strength alloy, rolled threads
Cap: Billet machined
Indexed Bubble Studs: Easy positioning of the yoke
Kit Contents
Billet caps: 2
High-strength bolts: 4
12-point double-hex nuts: 4
Includes all necessary bolts and nuts to install a propeller shaft onto a 10-inch quick-change (1350 flange).
Benefits
Prevents deformation of U-joint caps that often occurs when U-bolts are tightened - improves bearing life
Ideal for use in high-output / high-torque vehicle drivelines
In competition vehicles that frequently require removal and installation of the propeller shaft due to clutch swaps or transmission maintenance, using flimsy steel U-bolts like those shown below can lead to bolt stretch, thread damage, or in the worst-case scenario, damage to the U-joint needle bearings or failure of the U-bolt itself, causing the propeller shaft to detach during operation.
Modern power competition and the constant improvement in race tire grip show no signs of stopping, with over 1000 horsepower being applied to these two U-bolts. Even if the quick-change unit itself can handle over 1000 horsepower, standard U-bolts cannot.
It is no exaggeration to say that this Mark Williams machined chromoly U-bolt kit, which we at Shafutoya almost always have our competition users install, is trouble-free. Please be sure to install this alongside your quick-change.
Before Ordering
〇 Regarding Import Consumption Tax
At the Shafutoya shopping site, we pay the import consumption tax incurred at the time of import on your behalf, so there are no additional charges beyond the total amount paid at checkout.
〇 Checking Compatibility
All of our product databases are based on North American specification vehicles (USDM). Please confirm compatibility with Japanese specification vehicles (JDM) before ordering. (If you are unsure if the listed product fits your vehicle, please feel free to contact us. Our support team will investigate for you.)
If you order without confirming compatibility, we cannot accept returns due to incompatibility.
Please note that even if items are sorted by selecting the year, manufacturer, and vehicle model in the tabs on our top page, it does not necessarily mean they will fit Japanese model vehicles without modification.
All products have been translated into Japanese using translation software. There may be confusing expressions, so please contact us before ordering if you have any questions.
○ Regarding Shipping
Shipping costs are paid at the time of checkout. Shipping cost estimates are automatically calculated when you enter your shipping address on the checkout page. For large items such as body parts, the automatic shipping calculation may occasionally differ significantly from the actual shipping cost. In such cases, we will contact you individually via email.
Basically, all products are shipped internationally from our U.S. warehouse. Unlike domestic shipping in Japan, international shipping takes about 7 to 14 days, so please order with time to spare. If you are in a hurry, please contact us in advance to confirm the delivery date. All products are transported via air freight. They are not shipped by sea.
○ Regarding Japanese Vehicle Inspection (Shaken) Compatibility
Basically, all products we handle are designed and manufactured outside of Japan. Please note that they are not compliant with the "Japanese Vehicle Inspection System (Shaken)," and we cannot provide strength calculation documents for the Japanese Shaken system. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off-road," and please install and use them at your own risk.
○ Regarding Warranty
Please check the contents immediately upon arrival. Since all products are shipped internationally from outside Japan, there may be shipping damage to the packaging or the product itself. For products with shipping damage, defective items, or items different from what you ordered, we will provide returns, refunds, or replacement exchanges only if you contact us within 7 days of receipt. Please understand that for products sold through us, warranty support will be handled "exclusively through us." Please note that we do not handle support through other companies or distributors located within Japan.