check north jersey craigslist. When i was looking for a 4L60e for my car there was a handfull of LT1 ones for sale for decent price.
Have you tried to shift it manually ? Any difference between D and OD ?
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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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