The engine uses 10W-30 and the tranny uses 5W-30.

You are going to have to look deeper to determine where the oil is coming from. The oil in the tranny does not get dark like engine oil, as it is not subjected to the same contamination from combustion. The fact it looks clean is not enough to determine where it is coming from.

Although, describing it as coming from the "transmission area" is a little vauge. That is an area approximately 4 feet long, between the block and the rear drive shaft. There are lots of spots for oil to exit in that span.

As far as telling exactly where it is coming from, usually you can do it by looking carefully. Oil only flows down, so find the highest dry spot and work down from there. Oil also only usually flows towards the rear of the rig. Again, find the cleanest spot and work aft. If it is really bad, degrease it, spray it clean and then check.

If it is coming from the bellhousing, it is more likely the rear main (or it could be the dizzy up on top). Mud will waste a rear main, and I have a feeling that is what happened. Time to drop that tranny.

I would also check the oil in the tranny to see if you might have gotten some water in there. Water will give the appearance of overfilling it and if it gets hot enough, it will start to boil off and cause a great big mess.

Michael