I could be wrong, but I believe the Converters were weak on those specific trucks. My buddy had a dually that had trans issues but after swapping the converter out for another it seemed to fix the issue.
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99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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