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All NEW Ford 9 Inch Third Members, Full Spool, 31-Spline

Price: $759.99 - $874.99
Sale: $759.99 - $859.99
Up to $65.00 off
Ford 9" Third Members - 31 Spline
Item #:
91048347
All NEW Ford 9 Inch Third Members, Full Spool, 31-Spline
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Our completely NEW 9" Ford third members start with an aftermarket heavy-duty cast iron carrier featuring a new cast iron Daytona pinion support and larger bearings. Then we use your choice of a standard (8.9 lbs.), lite (6 lbs.) or megalite (5.55 lbs.) steel full spool.

Each is available with your choice of 3.50:1 to 7.33:1 gear ratio ring & pinion. Also includes NEW bearings and Viton high-temperature seals. Professionally assembled for oval track race use and shipped in a re-useable plastic storage case.

Third members are made to order. Please allow 24-48 hours for order to ship.

Available options include a yoke to accept 3 1/4" Chevy/GM U-joint (add 91048339) and lightening of the ring gear to remove weight (add 91600013).

WARNING: Circle track racing applications require a minimum of 4 qts. of rearend lube. Using less than this amount will lead to immediate pinion failure.

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Option - Yoke for 3-1/4" U-joint with 1-1/16" Caps
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Item #:
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Item Details:
Allows the use of a Chevy/GM U-joint with your 9" yoke. You must order a third member before selecting this option.
Open Kit Components
- Selection of individual components may be necessary for kit purchase.
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  • Ford 9 Inch Third Member Assembly, Full Spool, 31-Spline
    Ford 9 Inch Third Member Assembly, Full Spool, 31-Spline
    Price: $599.99 - $719.99
    More Info
    Ford 9 Inch Third Member Assembly, Full Spool, 31-Spline
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    • Professionally assembled for oval track racing only 
    • Includes Pro Gears ring & pinion 
    • Your choice of gear ratio, 3.50:1 to 7.33:1
    • Includes 3-5/8" stock Ford yoke
    • Viton high heat pinion seal 
    • Solid pinion bearing spacer with shims
    • Plastic storage case
    910-48343 Instructions (PDF) 
    Third members are made to order. Please allow 24-48 hours for order to ship.
    Order applicable spool:
    • STD = Standard
    • LITE = Lightweight
    • MEGA = Megalite
    Available options include machining of the yoke to accept Chevy/GM U-joint (add 91048339) and lightening of the ring gear to remove weight (add 91600013; 5.37:1, 6.66:1, 6.83:1, 7.00:1 ratios are already lightened).