Hello everyone, Im new to jeep’s and this forum I just got my wrangler 3 days ago and I took it to a mechanic he told me I need the front U-Joint of rear shaft that needs replaced. He said its unsafe to drive with it with the condition that it in and that in could break. I have no idea what this part is, what it costs and how hard is it to replace. Any help would be greatly appreciated. It’s a 1993 wrangler S V6 manual with 164.000 miles/ thanks!