ok so i started feeling a vibration in the whole truck, so i checked the rear diff, and it looks like the spider gears are wearing through the case! unless this case is made with little slots for the backside of the spider gear that im unaware of. there is no metalic color to the oil or anything? im puzzled. does anyone have pictures of their rear diff assembly with the pan off? if i could compare to another rear end i would have the answer to my question! my email is jordanhill2@hotmail.com incase anyone has pictures. thanks alot guys!

 

I think i read a post like this before and the guy had pics of it and it was actually some slots in there that looked like what you are describing, but turned out they were supposed to be there. My 3500 started to vibrated the whole truck to at takeoff and it turned out to be just the hanger bearing and a u-joint maybe you should check those first. I will look for that post for you too though

 

cool thanks. i have looked for hours for better pictures of the limited slip unit, but its hard to see that angle i need in their pictures haha. well thanks for your help!