There is one on each end of the crankshaft. The front main seal is at the pulley and, while the rear main is at the transmission end.
on the top of the truck
Should pull the drive pulley and then you can pop off the old seal with a screw drive and press in the new seal.
You have to remove the drivebelt accessories and then remove the timing covers and take out the timing belt or chain. Basically you have to tear the side of the engine apart to get it out. It's a good day or two of work.
You have to remove the serpentine belt and drivebelt accessories then the passenger side engine mount, remove the timing cover, remove the timing belt, and the crankshaft sprocket to access the seal. It's about a day and a half of work.
You have to remove the transmission from the vehicle, then remove the flexplate from the crankshaft. The seal is directly behind the flexplate.
5-6 hours
Oil leaks because a seal has failed.
It is on the front of the crank shaft. It seals the oil at the crank pulley.
Obviously a seal has failed.
Failed front main crankshaft oil seal.
It could be. It could also be a pump seal failure, or a crack in the trans case.
Go to a Dodge dealer and buy a new neck, will come with a new seal.