I have a 86 SE with a 3.4l pushrod engine and 3 speed auto trans that has a vibration when accelerating. It's bad between 2000-3000 rpm. I've replaced the axle shafts, checked transmission mounts and engine mounts, control arm bushings. Ball joints and tie rods are all good. Does the transmission have support bearings for the axle shafts? The left axle seems to have a good amount of up and down play. It's driving me crazy!
88 Coupe: 2.0L Turbo 4 Cylinder, W2A, T25 Turbo.
84 Indy #64: Restoration Project, Super Duty 4 swap