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I discovered a small crack in my ES mount a couple years ago (one week before Fredericksburg). I had the old style mount without the plates that box in the strut mounts and the gussets on the forward isolator arms. The ES uses the same mounting system for the strut as the IV, but we don't have the mechanism to swing the gear. After discovering my crack and after posting it to the Yahoo ES group, a couple other guys found cracks in the same place. Several ES guys have modified their old style mounts with gussets and plates boxing in the strut mount area, basically bringing it up to current production specs.
The other mod that has been done is to add a crossbar and diagonal brace to the forward isolator arms. I think structurally, it's superior to use the crossbars vs. the gussets. With the IO-550N, you can run a straight crossbar between the isolators and clear the oil pan. With the TSIO-550, you need to have a curved crossbar.
I've attached a couple photos of my mount cracks and the modifications.
Mike Easley
ES
Colorado Springs
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