Ford 9 Inch Third Member Assembly, Full Spool, 28-Spline
Ford 9", Grand National, Full Spool Differential Type, 28 Axle Splines
- Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
- 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 stock Ford yoke
- Viton high heat pinion seal
- Solid pinion bearing spacer with shims
- Plastic storage case
- Weighs 78.0 lbs
910-48342 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).
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.
No warranty is offered or made for durability or specific performance. No warranty is offered for commercial, off road, street performance, or racing use.
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Q & A
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Lucas P. explains how to choose the correct part for a Ford 9" third member build in order to achieve a bulletproof rear. You will find specific recommended parts to use from Speedway Motors.
Diagrams showing the proper measuring techniques for axles and identification diagrams for the various 9-Inch housings.
A brief overview of the steps Speedway Motors takes to ensure you get a quality differential.
In this Tech Tip, John responds to a customer looking to upgrade the 8” stock differential in his Cougar to a 9” open diff.