front end shaking during low speeds

Ok let me start off by saying I have a 06 taco 2wd I dont do any off roading just city driving I have a 2.5 lift and really large nitto trail grapplers. With Factory shocks and struts(I know realize that I should have upgrated years ago with lift) This past week my front end has been shaking really bad when I go below 15 mph. It does it if I brake or if I slowly glide to 15-5 mph. Took it two a truck shop and they drove it said my shocks and ball joints look good they said my front U- Bolt on the drive shaft was about to fall off and was bad and replaced it. Well it still shakes? Do I need to get ready to fork out money for new shocks & Struts any ideas would be greatly appreicated.I dont want to be driving and a wheel fall off!