okay...

tell me what you think of this.

my abs light came on in the dash just now. I checked the computer LED and its blinking 8 times in a row. The FSM says this is a rear left wheel speed sensor.

I mentioned before that i had to put this computer in myself. So maybe i screwed up and didnt put it in right? I also read in the FSM that the transmission adjusts its shift points in accordance with signals sent from the ABS...

SO:
could the problem be all within the ABS computer??
or does the speed sensor for the rear-left wheel control the rear differential, too? and could that be the problem

I heard several times that uneven tire size could cause this; so what if the car "thinks" the wheels are moving at different speeds because the sensor is busted?