The Eaton Detroit Locker is a 100 percent automatic locking differential that keeps both axle shafts driving at all times, so power still reaches the wheel with grip even when the opposite tire lifts off the ground. It is built for maximum strength and traction, takes no driver input, and needs no routine maintenance. This unit is configured for the Ford 9in center section axle.
- Type: Automatic locking differential (Detroit Locker)
- Axle: Ford 9in center section
- Ring gear diameter: 9in
- Axle shaft diameter: 1.32in
- Spline count: 31-spline
- Gear ratio: All except 2.72
- Part number: R18703A
Axle Fitment
- This unit is built for the Ford 9in center section axle (31-spline, 9in ring gear, All except 2.72). It is found in Ford 9in dropout / center-section builds, popular in circle-track and hot-rod axles. Confirm your axle and spline count.
FAQ
What does the Eaton Detroit Locker do?
It is a 100 percent automatic locker that keeps both wheels driving for maximum traction.
Which axle and spline count does part number R18703A fit?
It fits the Ford 9in center section axle, 31-spline, 9in ring gear, All except 2.72. Confirm your axle and spline count before ordering.
Is the Detroit Locker street friendly?
It is a full automatic locker built for maximum traction and strength. It can exhibit normal locker characteristics on the street, so it is chosen where traction is the priority.
Does it require special additives or maintenance?
No routine maintenance and no friction-modifier additive are required.

