Fits Ford 9 In. 3rd Member Assembly 31 Spline STD Spool 3.70 Gear Ratio

$689.99 Buy It Now or Best Offer
free,30-Day Returns

Seller Store speedway_motors
(294115) 99.5%,

Location: Lincoln, Nebraska
Ships to: US,
Item: 387187254598

Return shipping will be paid by:Buyer
Returns Accepted:Returns Accepted
Item must be returned within:60 Days
Refund will be given as:Money Back
Return policy details:
Speedway Motors:Speedway Motors
Type:Differential Third Members
Manufacturer Part Number:91048343-370-STD
Item Width:13.000
Item Length:18.00
California Prop 65 Warning:True

These Ford 9″ rear ends are hand-assembled by trained experts in-house, Has a nodular iron housing that is stronger than OEM “gray” iron and has 4 lbs. of additional reinforcement, Use of a large bearing “Daytona” style pinion bearing supports for strength and reliability, A spacer and shim setup maintains critical pinion depth settings and easier to service than traditional crush sleeves, The gear units are built of long-wearing 8620 cold-rolled steel, lightened gear options available Ford 9 In. 3rd Member Assembly 31 Spline STD Spool 3.70 Gear Ratio Sku # 91048343-370-STD Mfr. Part # 91048343-370-STD Condition New Brand Speedway Motors Sold Box Details Info Assembled by Professionals Hand-assembled by trained experts in-house, our Ford 9-inch third members are built from quality components with an exact step-by-step process. We bring this combination of precision assembly and quality components to you at a price that can’t be beat. We trust these third members so much, they’re the go-to choice for our own rides, from the street to the track. Tough, Nodular Iron Center Section Our Ford 9 Inch Nodular Iron Third Member Center Section Carrier starts with a NEW casting with over 4 lbs. of additional material in critical areas. Nodular (ductile) iron is much more resistant to fracturing than OEM “gray” iron. Extra ribbing reinforces the case and rearmost pinion support (pilot bearing). Thick, forged steel bearing caps surround the carrier bearings, all securely held in place with precision Grade 8 cap screws. The improvements continue with rugged billet steel adjuster nuts and heavy-duty keepers to ensure your ring gear settings are maintained. All mounting surfaces are precision machined to ensure a consistent, flat surface for a positive gasket seal (no more leaks on your shop floor). An oil fill plug is included. Precision Assembled For Proper Ring Gear Teeth Pattern Getting a proper pattern on the ring gear teeth is crucial. Our time-proven, step-by-step process ensures the correct backlash, preload, and proper amount of pinion shims to ensure the correct pattern on the ring gear teeth. To ensure a proper gear pattern, we use a stronger “Daytona” style pinion bearing support to maintain that critical pinion depth setting. Stronger due to its larger bearings, our Daytona pinion support also uses the spacer-and-shim setup to maintain critical pinion depth settings under high load, unlike traditional crush sleeves which often compress further, take out your preload and lead to failure. With solid bearing spacers and the proper shims, we eliminate this problem and make setting preload easy and repeatable during installation, service and gear changes. Since preload is already set, simply torque the pinion nut to 160 ft./lbs. and you’re good to go. The pinion gear is connected to our new, forged steel “Ford short”, 1310-type pinion yoke. Note – Speedway Motors Differential 3rd members come with a 1310 Universal Joint (U-Joint) series yoke. No other Yoke size options are available. 1310 series U-Joint and Bearing Cap Reatainers Not Included – Gear units are built from long wearing, tough 8620 cold-rolled steel. We offer lightened gear assemblies from 5.29:1 to 6.50:1, select the “L” option (example: 529L) from the gear ratio selection. Variety of Spool Options A variety of spools are available, in gearing from 3.50:1 to 7.33:1. Our CNC machined full spools are stronger than mini spools and available in standard, lite and mega-lite configurations: Standard (STD) full spools are CNC-machined and built for the strip and high-horsepower/torque applications when the ultimate in durability to handle high-traction power is needed. Weight 8 lbs. Mega-lite (MEGA) full spools are great for lower traction applications such as dirt racing, lowering your rotating weight, reducing your time to peak RPM and reducing unsprung mass. At just 5.49 lbs., these spools are nearly as light as aluminum but have the strength of machined steel Lite (LITE) full spools are a good combination of weight reduction and CNC-machined steel durability, and weigh only 6.1 lbs. Proven Reliability We race what we sell. Our third member units are the go-to choice for our own rides and racecars and we have built these units to last with high quality hardware and components. Tapered steel roller bearings minimize friction, better handle thrust loads and increase load carrying capacity. The ring gears are assembled with Grade 9 bolts with a tensile strength of 180,000 psi, a 15% increase over Grade 8 hardware. Heavy duty Grade 8 carrier cap bolts, a lock-style pinion nut with pre-applied Loctite and high-quality grade 5 pinion support bolts make our third member near-bulletproof. Units include a Viton® pinion seal providing long lasting oil and chemical resistance. This seal retains elasticity up to 399°F (204°C) and intermittently up to 600°F (316°C) This high temp seal helps eliminate pinion leaks, reduces maintenance and keeps the third member properly lubricated. A carrier-to-housing gasket is available separately. Our hand-assembled Ford 9 inch third member assemblies are made-to-order. We keep a supply of the most popular gears in stock, with most units built within 2-3 days. Our third-member units are shipped in a durable, reusable poly storage case, perfect for keeping multiple gear sets stored and ready for the track. Features Hand-assembled by our trained technicians for an unbeatable combination of quality and value Track-tested durability in our own cars – we race what we sell Precision assembly for the correct backlash, preload, and proper amount of pinion shims to ensure the correct pattern on the ring gear teeth Nodular iron housing is stronger than OEM “gray” iron and has 4 lbs of additional reinforcement Large bearing “Daytona” style pinion bearing supports for strength and reliability Spacer and shim setup maintains critical pinion depth settings and easier to service than traditional crush sleeves Full spools available in standard, light and mega-lite configurations Gear units built of long-wearing 8620 cold-rolled steel, lightened gear options available Ring gears assembled with Grade 9 hardware, 15% stronger in tensile strength than Grade 8 Viton® pinion seal, resistant to chemicals and high temperatures Grade 8 Carrier cap bolts Lock-style pinion nut with pre-applied Loctite® Grade 5 pinion support bolts Includes form fitted, reusable red poly storage case Charts (PDF) Installation Tips NOTE: Circle track racing applications require a minimum of 4 qts. of rearend lube. Using less than this amount will lead to immediate pinion failure. Upon receipt and unboxing of your newly purchased 3rd member, prior to installation, it is recommended that the unit be prepped for installation by cleaning the surface of the unit with a form of cleaner such as aerosol brake cleaner and an air hose/compressed air. This is a normal step in your installation process, and this will properly and sufficiently remove any packaging remnants from the carry case / carry case hardware that may be found to adhered to the 3rd member surface upon receipt. 1310 series U-Joint and Bearing Cap Reatainers Not Included – Sold Seperatly 1310 Series U-Joint Measurments: Yoke Width 3-7/32″ Cap Diameter 1.062″ Recomended 1310 Universal Joint (U-Joint): Speedway 1310 Series Chevy to Chevy U-Joint – Part Number Dana Spicer 5-153X HD Greasable Cross U-Joint Chevy 1310 Series – Part Number Heavy Duty Greasable Cross U-Joint, 1310 and Driveshaft U-Bolts – Part Number Recomended U-Joint Bolts/Retainers: Universal Drive Shaft U-Bolts, 1-1/16 Inch Cap – Part Number Fast Shafts BBSK-10 Billet U-Bolt Strap Kit, 1-1/16 Inch – Part Number Moroso U-Joint Girdle – Part Number Specs Sold in Quantity Each Gear Material Steel Ring Gear Weight Standard Differential Type Full Spool Spool Weight Megalite Yoke U-Joint Series 1310 Housing Material Cast-Iron Weight 77 Axle Splines 31 Gear Ratio 3.70:1 Yoke Included Yes MFG. Part # 91048343-370-STD Ring and Pinion Included Yes Reviews Dont know if I would buy again Rated by Henry on January 03, 2022 Summary: Set up with a lot of bearing preload but didnt get too hot on break in. Pinion seal has small leak after first 10 mile road trip so might have to replace pinion seal. No, I would not recommend this product. I would buy this again Rated by Roy on December 22, 2021 Summary: Put it in a 69Ranchero upgraded axel and bearing works awesome fun to drive Yes, I recommend this product. Yes I would buy this product again.. Rated by Jimdandy on August 04, 2021 Summary: i put it in my super stock race car. Yes, I recommend this product. Literally bolt up and go Rated by BJ on June 24, 2021 Summary: Great quality, racecar runs amazing and has amazing power because of this gear! Yes, I recommend this product. I have bought this product again and again Rated by Roger on June 04, 2021 Summary: I have used this product many times and they are great! Especially for the price Pros: Very knowledgeable staff Yes, I recommend this product. Related Items / Suggested Parts Yoke Option for 3-1/4 Inch U-Joint with 1-1/16 Inch Caps 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 72 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.

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