Overview
The Detroit Locker 187SL16C is an automatic locker for Dana 44 axles with 30 splines. It is designated for a 3.92 Up gear ratio.
Eaton makes the Detroit Locker, which delivers 100% of torque to both drive wheels and keeps both wheels in constant drive. It allows wheel speed differences when needed, which helps traction in mud, snow, rocks and on the track.
Key features
- Automatic locker for Dana 44 axles
- 30 spline axle fit
- Title lists 3.92 Up gear ratio
- Delivers 100% of torque to both drive wheels, per Eaton
- Front and rear axle locations
Gear ratio and locker setup
Gear ratio determines how the axle multiplies engine torque and how fast the wheels turn at a given road speed. A locker does not change the ratio, but a mismatch with tire diameter can make the drivetrain work harder. Before ordering, confirm the axle’s ratio and tire size together, since a locker installed in a mismatched setup can wear faster than expected.
Installing a locker is a job where a clean carrier and careful torque settings matter. Pinion preload, ring gear backlash and bearing condition all affect how the locker runs. Many owners have the setup professionally checked, then road-test it slowly in an open area to confirm smooth engagement before trail use.
- Confirm the ring gear ratio before buying
- Check pinion preload and backlash
- Replace worn carrier bearings during the job
- Road-test slowly before trail use
Specifications
| Brand | Detroit Locker |
|---|---|
| Part number | 187SL16C |
| UPC | 70000010111 |
| Manufacturer | Eaton |
| Differential type | Automatic locker |
| Axle spline | 30 splines |
| Axle type | Dana 44 |
| Axle location | Front and rear |
| Gear ratio | 3.92 Up (per title) |
Vehicle fitment
The Detroit Locker 187SL16C has no vehicle list attached. Its axle requirement is Dana 44 with 30 splines and a 3.92 Up gear ratio, so check those against your axle before buying.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Confirm the 3.92 Up designation matches your gear ratio before ordering. A professional fitting is the safer route for a locker, and test it in a safe, open area afterward.
What’s included
It is one locker. No hardware or setup kit is included, so plan for those before installing.
