9 Inch Floater Rear End Axle with Adjustable Metric Brackets

This full floating 9 inch Grand National rear end kit has brackets welded on to for use with Metric chassis cars, Includes lightweight steel 2.5” Grand National hubs with full floating axles and 5/8” coarse wheel studs which not only save weight compared to other hub designs but also provide incredible strength, 5 position adjustable lower brackets are approved for use in IMCA Stock Car and popular for other circle track classes and sanctioning bodies such as street stock or factory stock, Complete and convenient bolt in floater rear end kit accepts Metric brake calipers | Spring perches are not installed or included allowing you to the choose the spring

size and location to match your car, Choose from 58” or 60” hub to hub width in a centered pinion location as well as your choice of 5 on iframe * img img span + , img , , , img img h3 span + span:after span:last-of-type:after 9 Inch Floater Rear End w/ Adjustable Metric Brackets, 5x4.75, 60 Sku # 91048425-60-43/4 Mfr. Part # 91048425-60-43/4 Condition New

Brand Speedway Motors Sold Kit Details Direct bolt in for GM Metric G-body race car chassis IMCA approved for Stock Car and classes with adjustable lower arm mounting points Machined full floating axle housing design with fully welded 3-inch axle tubes Pre-fitted upper and lower control arm mounts and disc brake caliper brackets Fully machined 2.5-inch axle tube ends for fitting Grand National hubs Lightweight steel hubs use 2.5-inch ID tapered bearings for increased loads Axle housing features centered pinion design for maximum driveshaft clearance Available in 58 and 60 inch wheel flange to wheel flange measurements Floating hubs are offered in 5x5 and 5x4.75 wheel bolt patterns with 5/8-11 studs Includes 31 spline solid axles that fit popular differentials and spools Housing includes oversized fill and drain plugs for easy fluid changes NPT threaded axle vent located on main housing 24-spline drive plates with aluminum axle caps allow easy axle removal 11.75-inch disc brake rotors, bearings, seals, and hardware included Only needs disc brake calipers, spring perches, and third member to complete Upgrade To a Full Floater Rear End for Increased Strength and Safety The full floating rear axle has been around for decades. Primarily designed for heavy duty truck use, it was found to be a great solution for circle track racing and has been a race-spec axle housing used in all levels of circle track racing ever since. Today you’ll find high horsepower street cars that see extreme cornering g-forces (auto crossing, road racing, etc.) using full floater rear end setups as well. So why the change to a full floating axle from the more conventional semi-floating axle found under just about every rear drive production car made in the last century? It’s easy really when you compare the differences between full floating vs semi floating axle assemblies. In a semi-floating axle, such as the popular GM 10 and 12 bolt rears, or Ford’s 7.5- and 8.8-inch rear ends, the axle assembly is retained by a C-clip at the differential end and rides on a single bearing seated in the end of the axle tube. The full weight of the vehicle rides on this single small bearing while the differential end of the axle shaft floats in the differential or spool, hence the “semi” floating term. This design puts a lot of stress on the axle bearings and seals and it is not uncommon to bend axle flanges in hard cornering or chew up a bearing (which ruins the axle). Additionally, if the C-clip should fail from side loading, or the axle break from excessive torque, the broken axle with wheel and tire assembly can exit the axle housing causing extensive damage and loss of control of the vehicle. While a bolt-in axle like the popular Ford 9-inch is an improvement, axle flange stress can still lead to bending or breaking right at the bearing in hard cornering. Meanwhile, the full floating axle uses a hub that rides on a pair of large bearings on the end of the axle tube itself (similar to your front disc brake rotor and spindle). This allows the full weight of the vehicle, as well as all acceleration, braking, and cornering forces to move through the axle housing itself. Due to the dual bearing hub on the end of the axle housing the axle itself “floats between the differential or spool and a splined drive plate that mounts between the hub and the wheel (engaged via the wheel studs), thus the “full floater rear end.” If an axle should break in a full floating rear axle there is zero chance of losing a wheel and tire assembly. Furthermore, due to the fixed hub location disc brake pad knock back (a common issue on semi-floating axles where hard cornering pushes the caliper pistons into the caliper) is eliminated. This provides constant and firm brake pedal application no matter the cornering forces. Hit our Toolbox article on The Toolbox-Should You Use a Full Floater Rear End? for more details. Strength and Precision That Can Handle the Track or The Street Standard production car rear axles are assembled with thin wall press in axle tubes that often use nothing more than a couple of plug welds to secure. This allows the axle tubes to flex at the union with the main housing, causing axle stress, rear alignment changes, and fluid leaks. Sure, these areas can be welded, but you’re still left with those C-clips and the unsure feeling of what will happen if you ever break an axle. Our full floating rear end housing is a precision made fixture welded piece using all new thick wall steel, including the center section, which has a fully welded machined mounting surface for the third member, virtually eliminating any potential leaks at the housing to third member union. No ancient used center with just new axle tubes welded in here. The larger center section allows additional oil capacity for increased cooling (we recommend filling with 4 quarts of Shop Gear Oil). Oversized fill and drain plugs allow quick fluid changes or draining for differential/gear swaps. Speaking of gear swaps, we know that you have at least a few 9-inch Shop 31 Spline Complete 9-Inch Third Members for various track conditions or track layouts/lengths and utilizing a full floater axle housing makes these gear changes effortless. Simply unbolt the drive plate cap, screw a 3/8-24 bolt into the end of the axle (or use our nifty Threaded Axle Puller Tool) and pull the axles out to clear the differential or spool and then swap to your needed gear ratio. No longer do you have to pull wheels, brakes, and more to slide out a traditional axle assembly to clear the differential or spool for pulling your third member for a gear swap. The included 31 spline axles will handle just about any power you can push downstream to the axle and are suitable for circle track, road course, and street use, though we do not recommend for extreme high horsepower drag racing use, which generally relies on 35 or 40 spline axles. Pre-Installed GM Metric Control Arm Mounts and Disc Brake Caliper Brackets We make installation into your G-body stock car or other GM Metric chassis setup with our welded upper and lower control arm mounting points already in place and ready to go. The upper mounts are reinforced with welded tabs and feature preinstalled bushings. The lowers use an adjustable control arm mounting position with five available mounting options. The adjustable lower control arm brackets have holes located 1-3/4, 2-1/2, 3-1/2, 4-1/4, and 5-1/4 inches from bottom of the axle tube to the center of the hole. Simply add your choice of Regular Spring Perch for 3-Inch Axle Tube or Light Weight Spring Perch For 3-Inch Axle Tube spring perches and you’re ready to bolt your new full floating axle into place. The pre-installed disc brake caliper brackets are designed to use standard IMCA Approved GM Metric Disc Brake Calipers to compliment the included thick 11.75-inch vented rotors included. These axle tubes feature a standard 2.625-inch ID, allowing optional Inner Axle Tube Seal to be installed for better oil control if desired. Axle lengths are measured from hub to hub and are available in 58- and 60-inch widths with a centered pinion location. The included Grand National style hubs include tapered roller bearings, tabbed lock washer with retaining nut to maintain bearing preload, and inner axle seal with spiral lock ring retainer. These hubs are available in either 5x5 or 5x4.75 bolt circle patterns. Both bolt circle patterns use 5/8-11 coarse thread wheel studs and include 1-inch double sided lug nuts. Due to the larger wheel stud and the 45-degree taper of the included circle track-style lug nuts most street-style wheels will not work with these hubs. If your wheels of choice use standard 1/2-20 wheel studs and 60-degree taper lug nuts, you can replace the wheel studs included in this kit with our special Grand National 1/2-20 Screw In Stud Kit for Grand National 5x4.75 Hub on the 5x4.75 bolt circle pattern hub only (5x5 hub is press fit studs and not compatible with these optional screw in studs). You can learn more about 45 vs 60 degree taper lug nut applications in our The Toolbox-Wheel Lug Nut Size Guide + Torque Spec Chart in The Toolbox. Kit Includes: 9-inch Grand National full floater axle housing with adjustable Metric control arm brackets Lightweight Grand National hubs in your choice of wheel bolt pattern 31 spline solid axles Lightweight vented brake rotors 2.5-inch Grand National bearings 24 spline drive plates 11.75 inch vented disc brake rotors All seals and hardware required for assembly of hubs and rotors Needed to Complete: Coil spring perches GM Metric disc brake calipers Complete 9-inch center section Specs Sold in Quantity Kit MFG. Part # 91048425-60-43/4 Position Rear Overall Width 60" Axle Shafts Included Yes Axle Splines 31 Axle Type Full Floating Brakes Included Yes Third Member Included No Ring and Pinion Included No Wheel Studs Included Yes Wheel Stud Thread Size 5/8"-11 Wheel Bolt Pattern (in.) 5x4.5 in. | 5x4.75 in. Bearings Included Yes Seals Included Yes Differential Included No

Material Type Steel Finish Black Oxide Ring Gear Size 9 Inch Differential Type Limited Slip Tube O.D. 3" Housing

Material Steel Hardware Included Yes Rotors Included Yes Rotor Diameter 11.75 Inch Housing Color Gray Cut to Fit No Standard Pinion Location Offset Pinion / Centered 3rd Member Bolt Pattern 5 on 4.75" Rotor Style Plain Face Reviews I would buy again Rated by Richie on December 21, 2025 Summary: Bolted right in only down side is no shock mounts or coil mounts Yes, I recommend this product. I will be buying this again for my other son's stock car Rated by Brian on December 19, 2025 Summary: We used this rest on an asphalt circle track stock car. Yes, I recommend this product. great deal, excellent product Rated by crazy canuck on September 26, 2022 Summary: building g-body slalom, drag, track day, all round street car with 455 olds 5 speed stick Yes, I recommend this product. very impressed with craftsmanship Rated by protouring buick on August 22, 2022 Summary: money well spent Yes, I recommend this product. Great Racing Ford 9" IMCA Rear End Set Rated by Stock Car Driver on August 17, 2022 Summary: For a starting rear end unit, this is a great purchase. Set does not include Inner Axle Seals and the lower holes on the brackets are very thin and will snap off. Overall unit is built very well and highly recommend them. Yes, I recommend this product. Related Items / Suggested Parts Lucas Oil 10121 SAE 75W140 Synthetic Racing Gear Oil, 1 Quart 9 Inch Ford Rearend Axle Housing 3rd Member Pumpkin Gasket Third Member Mounting Hardware, Ford 8 In/ 9 In Rear End Ford 9 Inch Limited Slip Posi Differential Third Members, Clutch Ford 9 Inch Third Member Assembly, Full Spool, 31-Spline Tech Support We're here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through eBay Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s

size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.