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The front differential is an "open" differential. No limited slip components there.
The actuator of the Dodge Ram 4x4 is located on the top of the front differential. Depending on the year, the actuator is either vacuum or manually operated.
The front differential uses 80w90.
I do not think that there is a front axle disconnect. If there is then it is vacuum controlled and the problem is either a switch or a broken line.I do not think that there is a front axle disconnect. If there is then it is vacuum controlled and the problem is either a switch or a broken line.
Dodge 2500 and 3500 4x4 trucks use a split front axle that is engaged with vacuum lines that run from the intake to the transfer case then to the front differential. That was true up till 2002, after that the shifter on the axle was electric if it had one at all.
On a Dodge truck, the vacuum switch is on the transfer case.On a Dodge truck, the vacuum switch is on the transfer case.
Check the vacuum line to the front differential.
You unscrew the plug on the front cover, and ad 75w90 to the bottom of the hole.
Dana 216 FBI (Dana 44)
The front axle is engaged by vacuum. Most common is a cracked or leaking hose but can also be holes rusted in the vacuum canister. This canister is mounted on the front axle, passenger side. Sometimes they just get gunked up and need cleaned and lubricated to get them working again. When it is working properly the vacuum pulls a fork inside the axle. That fork slides a gear that connects the wheel to the differential axle. So without vacuum the 4x4 cant engage. In most cases it comes down to issues near this canister. Check it and see.
if 4x2 only 1 differential which is the pumpkin between your rear axle, if 4x4, there will be a transfer case at the front of the vehicle coming off of the transmission going to front drive shaft and front differential.
It is a vent tube to let pressure out of the differential housing.