Yes, in a way.
I have mine set up with a fully automatic shifting system so that if OD is turned on "Auto" mode OD will come on at 55mph, and the same with lockup at 75mph
I can turn either/or off, so they don't engage at 55 and 75.
If both switches are in Auto mode the trans shifts 1-2-3-OD-lockup all on it's own.
Then when slowing lockup disengages at 75, and the OD disengages at 55.
I don't have to touch anything unless for example I want out of lockup and I am above 75, then I have to turn it off manually. (same with OD if I am over 55 and want out of it)
I can also skip OD completely by leaving the "4th" switch off and it will shift 1-2-3 and then lockup at 75.
Or I can leave "5th" off and it will shift 1-2-3- then OD at 55.
Turn both switches to off, and it shifts like a normal 904 without OD or lockup either one.
It also has an adjustable vacuum switch that kicks lockup out if too much throttle is used, and then re engages as I let off and engine vacuum comes back up.
This works well if climbing a big hill and I lay into it, as it will disengage lockup and downshift to OD.
I have yet to find a hill it won't climb at 80 or more in lockup, but I don't like to push the converter clutch too hard as it is the weakest of the clutches in a trans.
Plus I don't let the engine get below about 2,100-2,200 with a lot of throttle as I don't feel it's good for it to do high loads with low throttle.
2 adjustable pressure switches are used for OD and lockup that are physically plumbed to the governor port on the trans, so when governor pressure reaches that amount of psi at 55mph the switch triggers and OD comes on.
Same with lockup, but it is set higher at the switch to come in at 75mph.
