OK so Ive got a 65 mustang convertible that was restored i put a 5 speed in it and had a new drive-shaft made for it. Now when i get on the gas there is an awful lot of vibration it feels as though the car might shake apart. Now i put it on the lift and shook the drive-shaft there was play at either end,the rear end,and the tranny now my question is can someone please help me,i need to know can i tighten,shim or do i need another drive-shaft.Also i smell burning plastic when i get in and out of the car when its been driven. Any and all help appreciated thanks