4L80E Tran

1993 P30 Chev 6.2 diesel. 109000 miles. Just started late shift in all gears. Off about 10-14 mph. 2-3 28mph, 2-3 40-42- OD 62+mph. Unhooked speed sensor on
back of manifold, top of oil pump drive. Tran light came on but no differace in shifting. Any Ideas? Dealer wants $135.oo for sensor.
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