Ford 9 Inch Third Member Assembly, Mini Spool, 31-Spline
Ford 9", Grand National, Mini Spool Differential Type, 31 Axle Splines, Standard Spool Weight
- Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
- Profesionally assembled for oval track racing only
- Pro Gears ring & pinion
- Your choice of gear ratio, 3.50:1 to 7.33:1
- 31-spline premium mini spool
- New chromoly cross pin
- Viton high heat pinion seal
- Solid pinion bearing spacer with shims
- Provided with stock O/E pinion yoke
- Weighs 83.25 lbs
- 4.78 is Garage Sale Clearance
910-48341 Instructions (PDF)
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) or lightening of the ring gear to remove weight (add 91600013; ratios 4.78, 5.25, 5.37, 5.50, 5.57, 6.14, 6.66, 6.83, 7.00, 7.16, and 7.33 are already lightened). The letter "L" behind a ratio also indicates the availability of a lightened ratio.
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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A short article explaining the main differences between open and limited slip differentials.
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.
In this Tech Tip, John responds to a customer looking to upgrade the 8” stock differential in his Cougar to a 9” open diff.