nightstalker 6 - I have been having that rumble strips noise in my transmission for the last three months and could not figure it out. My tranny fluid is dark red, kind of like yours.
I noticed that the rumble sound only happened while "cruising", by that I mean 45mph and up at 1200rpms. I finally got fed up and took it into the dealership to get it checked out. Turns out my tranny is F####D. I just found that out today and I bought the PF seven months ago. I talked and pleaded to the dealer, and they seemed to have been very willing to help me out. They did a bunch of research into costs and availability and it turns out that they will get me a rebuilt transmission with a 3 year warranty and install it for $1200 as a sign of good will. The actual cost of the new tranny and labour is roughly $3500.
My symptoms are very similar to yours. Fortunately my dealership, Jonker Nissan in Surrey, BC, Canada is awesome. The guys there wanna help you and they treat me and my kids like family. They went out of their way to find an affordable solution to this issue and the only "GOOD" thing is that the cost is minimal compared to what it could be. As soon as the new tranny is in, it's bypass time.
