Sounds like the plate may be flexing fore/aft. My friends Chevelle has 4 rods to front and mid plates that go fore/aft to frame to stop that sort of movement.
He wasnt running crank trigger at the time he did it, just did it for "insurance" of not cracking a trans case...that was back in the days before it was common knowledge that solid trans mount was the likely cause of his case failures. His bracing of the plates stopped the case crack problem with solid trans mount. These days runs poly trans mount but still uses his fore/aft braces.(and a crank trigger)
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