The Strong Get Stronger! Mark Williams Releases New Big Bore Ball Bearing Case For 9″ Ford

The Strong Get Stronger! Mark Williams Releases New Big Bore Ball Bearing Case For 9″ Ford

With ever increasing horsepower and chassis designs that allow said horsepower to reach the track in more and more efficient forms driveline parts need to keep pace and the crew at Mark Williams Enterprises knows it. Not only to they know it, they live it and the proof is in the bombproof new Big Bore Ball Bearing Case for 9″ Ford rear axles. Featuring angular contact ball bearings, the ability to handle up to 10″ ring gears, available steel or aluminum main caps, and an available angular ball bearing pinion support, there’s nothing stronger or more efficient out there. Mark Williams Enterprises is even using an alloy 30% stronger than the typical 6061 aluminum used by other manufacturers.

This is one bad daddy and if you are either building a new race car or stepping up your existing one, you need to check this thing out. We’ve got the scoop below!


Mark Williams Enterprises has developed a new 4.000″ bore case for 9″ Ford rear end applications that employs angular contact ball bearings and significantly reduces friction while improving service life. A companion angular contact dual ball bearing pinion support also reduces drag and can enable cars to run quicker thanks to improved driveline efficiency.

The new M-W case is clearanced to accommodate up to 10″ ring gears and the big 4.000″ angular contact ball bearings provide better race strength than with tapered roller bearings. Likewise, the dual ball bearing pinion support, with inner and outer bearing raceways angled to accommodate radial and axial loads, reduces friction and increases performance potential. Both are available with full ceramic ball bearings for even more efficiency.

Manufactured from an aircraft aluminum alloy that’s 30% stronger than commonly used 6061, the case is precision CNC machined to assure exact component alignment. Featuring the M-W developed Thru-Bolt™ design, the case is available with either steel or aluminum bearing caps. The pinion support can accommodate 28-tooth and 35-tooth pinion splines.

Complete thirdmembers featuring 100% ball bearing efficiency are available with gear ratios from 3.70 to 6.20:1. For additional information go to or call the factory at 800-525-1963 for personalized tech assistance. Founded in 1964, M-W is located in Louisville, Colorado.

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