The 440-T4 speed sensor is a gear-driven thing with a 2-wire connector in the governor assembly--if you change tire size or something then you replace the little gear with a different tooth count to change the number of pulses. The signal is used by the ECM for TCC lockup, and also fed into an analog circuit that feeds the speedometer needle gauge.
On 4T60E and 4T65E (I think) the signal is generated by a reluctor gear and a magnetic pickup.
I am trying to figure out if the pulses are signal compatible (same number of pulses, same voltage peak, etc), or failing that are they interchangeable so I can move the speedo and/or governor assembly from the 440-T4 to a 4T6XE. After thinking about it last night, I doubt they are interchangeable because the 440-T4 requires some kind of mechanical input on the little plastic speedo gear, which is probably missing from the 4T6XE. Or maybe its possible to move the speedo drive from the 440-T4 over to the 4T6XE and interface that way.
Is the reluctor doing vehicle speed from the axle speed (after the differential), or from output speed (before the differential)?
I need to figure out where the 440-T4 signal originates as well. I am pretty sure it is vehicle speed since the FSM only talks about amplifying not modifying the pulses.
I know somebody I can ask, thought you guys might know
Originally Posted by jwfirebird
why you want to change the trans?
My 440-T4 has to be removed for repair. I'm under no obligation to put another 440-T4 back in the hole. I am looking very closely at putting a 4T60E or 4T65E with an independent TCU and only have a few integration issues to overcome for it to be a green light (speed sensor output being the main one at the moment).
I will share more information soon, as of right now I'm just researching to see what'* possible.