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Thread: 8L90 SHIFT SCHEDULING settings to not matter!?

  1. #1

    8L90 SHIFT SCHEDULING settings to not matter!?

    I keep having the issue of the transmissions shifting to early. In the shift tables lets say the minimum speed at 12 percent tps is 45 mph in 7th gear. It will still shift to 7th gear at 35 mph which isn't anywhere close to the speeds at the 7th gear table. The trans gear and diff ratio are set to the same ratio. Any idea why the transmission does not follow the shift scheduling tables at all?

  2. #2
    post the tune so it can be reviewed