Overview
The Detroit Locker 187SL16D is an automatic locker for Dana 44 axles with 30 splines. The title marks it 3.73 Down.
This design sends 100% of torque to both drive wheels, so both wheels stay driven. Wheel speed differences are allowed when conditions require it, which suits mud, snow, rocks and track use.
Key features
- Automatic locker for 30 spline Dana 44 axles
- Title lists 3.73 Down gear ratio
- Designed to deliver 100% of torque to both drive wheels
- Front and rear axle locations
- Allows speed differences between wheels when required
Ring and pinion matching
An automatic locker changes how a Dana 44 axle handles torque when one wheel loses grip, so the carrier and gear set around it matter as much as the locker. Confirm that the ring and pinion ratio fits the axle before fitting, and make sure the carrier takes the locker body without modification. A mismatch between gears and locker can cause noise and early wear.
Lockers add load to the axle shafts and pinion bearings during hard turns and climbs, so many owners replace the carrier bearings and pinion seal while the axle is open. Inspect the shafts around the spline area for wear before reassembly. Fresh gear oil with the additive the axle requires helps the locker engage smoothly.
- Check ring and pinion ratio before ordering
- Inspect carrier bearings during the install
- Replace the pinion seal while the axle is open
- Follow the break-in procedure for new gears
Specifications
| Brand | Detroit Locker |
|---|---|
| Part number | 187SL16D |
| UPC | 70000010124 |
| Manufacturer | Eaton |
| Differential type | Automatic locker |
| Axle spline | 30 splines |
| Axle type | Dana 44 |
| Axle location | Front and rear |
| Gear ratio | 3.73 Down (per title) |
Vehicle fitment
No vehicle list is attached to the 187SL16D locker. Its axle requirement is Dana 44 with 30 splines and a 3.73 Down designation, so verify both before buying.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Verify the 3.73 Down designation against your gear ratio first. Have a qualified axle shop fit it and check the carrier setup, then test in an open area.
What’s included
Review the package contents against your installation plan before the work begins, including carrier parts.
