Jerry,
Are you referring to the 5-wire little black box from JET?
The one that only ties into the MAP and throttle position sensors via 3 wires?
That one doesn't do anything with shift points. The auto trans will upshift at 5800rpm no matter what. The JET module I'm referring to does not do anything at wide open throttle. It does add some power at mid throttle, but the sensors are not read anytime you're over 85% thottle. Once you go 'open loop', only a reprogrammed PCM will make a difference.
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