Re: ABS Issue
I would have a look at the other wheel speed sensors if they are fixed well and if the wires to them are not rubbing against something.
You changed the transmission sensors you said? You probably have the 5-45RFE transmission, which has an input and output speed sensor, but none of them are used for vehicle speed. Vehicle speed is coming from both rear wheel speed sensors via the ABS controller.
There is furthermore a G sensor mounted under the rear seat. The input from this sensor is also used, together with the wheel speed sensors, to calculate the wheel slip. The system doesn´t wait until a wheel is really slipping, but already modulates the braking pressure when the wheel speed differs around 30 % from the actual vehicle speed. There are three channels for control, one channel for each front wheel and a single channel for both rear wheels.
One other thing, did you check your shocks? A bad working shock can cause a wheel loosing contact with the ground and this could activate the ABS to release that brake.