I have a 1989 ford ranger 2.9 4x4 and i am getting a shake that seems like it starts below the center consal and then works its self out towards the back. a little info i have had the transmission replaced and all the ujoints from the transfercase to the rear differential replaced i have also replace the main drive shaft. this shake only happens when i first take off and i am going about 5 to 10 mph then it is gone but it is noticible and it is preventing me from selling it. Can someone PLEASE HELP ME!!!!