I most likely have a messed up front differential on my 4x4.
I was wondering if I can just take my drive shaft off and run it on RWD only?
Can I just remove the universal joint pin and retain the rest inside the front diff?
Most 4x4 vehicles (as opposed to all wheel drive) do not have a differential in the transfer case. The Dodge Durango, has a non-differential transfer case, meaning that the front and rear drive shafts will spin at the same speed all the time in 4 wheel drive.
There shouldn't be any problem with removing your front drive shaft and driving your vehicle.
As a general rule, if you can switch the vehicle between 2wd and 4wd, there is no differential in the transfer case.