Dorman 600-399 Front Differential Lock Actuator Compatible with Select Dodge / Ram Models

Update: Ram 2020 Limited 1500. Updating in order to be fair, Actuator was not the issue. I had an Electrical issue, therefore the actuator was not getting power. Actuator fit perfectly and worked fine. Did not work out of the box. Hooked it up and was checking it before I installed and it did not work. I checked the plug and all 4 wires are good, ground is good and etc. It is getting all the signals it should get but still nothing.

Exact fit on my 2019 Ram 1500. Easy to install. It corrected the 4 wheel drive problem

Product worked fine on the bench when connected to a 12v 700a battery but was extremely difficult to stroke by hand. Once I got it on my truck it failed to stroke when it would receive an electrical signal and again I could barely move it by hand. I’m assuming the spring is far too strong for the power in the circuit. Called tech support and they were worthless just said to return it. I cleaned up the old oem one and it worked like a charm.

Fits 2019 Ram 1500 4x4 (w/ off road package) flawlessly and operated as intended. Don’t forget diff fluid.

Cured my 4wd flashing light on 2019 Ram 1500. Easy replacement - jacked up passenger tire and put jack stand under. Loosen the wire harness clamp first one back from plug (the lock tab is on top, so don't even mess with this until you remove unit). By jacking I also only lost about a tbsp of oil. Push the plug end up and angle toward top of passenger tire. Wiggle a little and it will come out. Now clean with brake cleaner or other and release lock tab and unplug. From here just reverse.

I’ll update if this fails. Purchased Feb 2026. I had just finished replacing the inner stub shafts for the front differential (flaw with Rams, the splines get ground to dust because of the lack of a dust seal and water/salt/dirt intrusion). Sometimes my 4WD would engage, most of time not, and I’d get a service message on screen. I had trouble codes for this axle actuator. Replaced, and now it shifts quickly like it used to. I’ll update if it fails, I’m good about that.

Item fit and worked just fine. The packaging was virtually non-existent. The part came loose in a cardboard box with no protective wrapping foam or anything of the sort. It had poked through the side of the box but fortunately nothing appeared to be damaged. It is much lighter duty than the OEM part. Fortunately it's only a half hour or so change, so if this one fails I'll go with a more sturdy one next time. In in

Instalation was pretty easy. Only lasted a couple months.

Perfect fit and works great. No issues. Dorman makes high quality parts! 2014 Ram 1500

Stop working after exactly 2 use twice 😡😡😡 i want my money back!!!!!!

Se lo instale una semana despues de que me llego, el mecanico me advirtio q esta pieza era china y q no garantiazba el funcionamiento. Aun asi le dije que la instalara bajo mi riesgo, pues bien despues de menos de un mes dejo de funcionar. Ahora tengo que comprar la refaccion original marca mopar, q cuesta el doble y tengo que pagar mano de obra extra. No lo recomiento.

Perfect fit! Right now I'm always driving in 4W Auto and I never feel it engage. Works great.

This worked for my 2015 dodge ram with no error codes coming up on dash unlike some other aftermarket ones. Way cheaper then oem .