All 3-speeds lock up mechanically...some later transmissions in the 904 family have an electrical connection but it's for unlocking the converter only.
Can you elaborate on this a little, John?
What we are trying to accomplish is to protect the lock-up clutch during heavy throttle 2-3 shifts. The full mechanical L/U valve body simply locks up the converter when it shifts into direct over X output shaft speed, which is probably about 45 MPH. The way I read the flow charts - no, you can't use the solenoid to lock the converter at will, as in 1 or 2 - it must be in direct to apply L/U. But can't the solenoid be used to selectively control L/U in direct? It seems to just bleed the signal pressure off going to the lock up valve to prevent the L/U valve from sending apply pressure to converter. We would like to be available to control L/U with a vacuum switch, toggle switch, or both.
So is this possible, or am I missing something here, such as also losing apply pressure to the front clutch, etc.
Thanks for any input you can provide.
