Bad knock and jerk
My 460ci gas F250 4wd experienced that jerking thing on a left turn only......ended up being something at the front left drive shaft. Seems to me it would be easier to look there first than pull that tranny. Of course I'm probably out in left field but it was a similar thing with the jerking and all so just thought I'd toss that on the table. 

Also forgot to mention that the fluid was more brown than red, and had an odd smell to it. Got the transfer case off and thats all in good order. Working on getting the trans off now.




(not that I would know but ya know what I am askin...LOL)
