Description
Payment & Security
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These axles are designed specifically for off-road enthusiasts to economically upgrade from a conventional truck floater to a bulletproof 40-spline floater setup. This assembly includes through-hardened and polished 4340 axles with a "donut" spline adapter and cover that are made to fit a 2005 - 2010 OEM F350 unit hub. MW donut spline adapter’s splines are manufactured with a slight crown that allows some misalignment without bowing the axle shaft. (This bowing creates forces on the center section that will eventually destroy gears and bearings.) Axle splines are true involute. The center section spline is available for any spool / carrier requirements. Axles made from 4340 material. Covers are anodized aluminum with low-profile sealing O-rings. Gun-drilling is available for up to 37" long with a 7/8" hole. Weld cups for the hub are available for 3-1/2" (p/n 50290) and 4.00" (p/n 50295) housing tubes.
Install appropriate weld cups, and download Service Bulletin #0100 axle order form to help gather your dimensions.
Check out our axle shaft/unit bearing combo for the cheapest AND strongest 40 spline upgrade available!
Complete Kit
The complete kit includes through-hardened and polished 4340 axles with a "donut" spline adapter and cover that are made to fit a 2005 - 2010 OEM F350 unit hub.
Shafts Only
Made from through hardened 4340, feature true involute splines, polished, shot peened, and black oxide coated.
XL Shafts
For lengths longer than 42" please select this option. Made from through hardened 4340, feature true involute splines, polished, shot peened, and black oxide coated.
Download service bulletin # 0100 axle order form to help gather your dimensions. Pricing is per pair.
Axle lengths will be determined after the sale. A representative from Busted Knuckle will call you to get measurements.
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return questions at burkeyracing@gmail.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, custom products (such as special orders or personalized items). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at burkeyracing@gmail.com.