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My leak is definitely the transmission not engine oil.

Not engine oil. Just changed the tranny oil with the proper oil as listed earlier in this thread. My best option right now is "don't drive on the highway for extended periods". So that is my plan. For now.

Thanks for the info. In my case, I don't have a leak when the truck is sitting still, or even when it has been run for a moderate amount of time. Only after it has been run at highway speeds for an extended period (over 20 miles). So, I would not expect the bolts to be leaking...

I took my truck out last weekend and ran some errands. Probably about 20 miles or so. All on local roads in traffic. I had no leak. But I am still concerned what it will do when I get it on the highway and run high speeds. Just makes no sense, seems it should leak all the time. Not just...

Napa 90w gl-1

That's EXACTLY what mine is doing!

Hard rocky bottom....and a friend with a bulldozer close by.

OK, I drained the oil this weekend....I could not really tell if it had water in it....I think it may have gotten water in it during my fording, but after the long drive home, most of it got cooked out..... Now it has fresh oil in it and is definitely not overfilled. So as soon as we get some...

I have not drained the oil....I plan on doing that Saturday morning....

OK, so where is the leak coming from? If there are no seals to leak....the only option is a crack? If the case is cracked, is seems it would leak all the time.

This really makes no sense when you think about it... If you overfill it and the oil gets hot and expands, where would it come out? I would think it would come out the vent on the top of the transmission, not somewhere inside the bell housing.

Ok, so why did it not leak on a trip 2 weeks ago? And why doesn't it leak now sitting at idle?

Bump..... Should it be sprayed with the engine running? Not sure how to get it all clean with it not running, But I know the fumes from many products can be sucked into a diesel engine and make it overspeed.

Should I spray the brake clean while the engine is running?

OK, I checked the gear box oil and it was about an inch below the fill hole. It was nice and clean honey colored. The oil on the ground was dark, but not as dark as the engine oil and it definitely smelled of gear oil. I also checked the vent, which I assume the the small 7/16 fitting on...

OK, well if my oil level is good then I guess I will have to look at this....but I assume I can't measure any clearances without removing the tranny and tearing it apart. Where is this plug exactly?

I hope you are right....will save me a ton of work....well, maybe...I guess I will still have to pull the transmission to clean off the clutch.

Yes, I did do a water fording....but it should not have been deep enough to get in the tranny. But that does make more sense than it simply being over filled. This truck was driven about 50 miles at interstate speeds about 2 weeks ago, and it did not leak, and nothing has been touched on...

I agree, I need to check the level, and will do so tonight. I was driving 55-60 most of the time. But It also leaked after I spent a few hours riding slowly on the trails and dirt roads.

As stated, I don't think it is an over filled situation. If it was, shouldn't it stop leaking after it dumps the oil down to the recommend level?