I put in stock rubber mounts when I replaced my engine (258,t-18,dana 300) and promptly broke the tranny mount, bent the passenger side motor mount and put the fan through the radiator.
Needless to say, I would recommend poly mounts. I put a set in mine when I put it back together and the difference is amazing. The shifter used to torque really badly during acceleration, now it barely moves.
As for vibes, I haven't noticed much of a difference, but then again, my Commando is not the smoothest ride on the street.

Needless to say, I would recommend poly mounts. I put a set in mine when I put it back together and the difference is amazing. The shifter used to torque really badly during acceleration, now it barely moves.
As for vibes, I haven't noticed much of a difference, but then again, my Commando is not the smoothest ride on the street.
