I have a 42RH behind my 5.9 Magnum built to look like an LA motor and used adjustable fuel safety cutoff switches plumbed off the governor test port.
An extra section of trans line runs from my governor pressure port up the back of my bell housing to the two adjustable switches on the back of my intake.
These two adjustable switches control relays to activate and deactivate OD and lockup.
Governor pressure relates very closely to road speed, so I adjust the switches for OD and lockup to engage and disengage at any speed I want.
Currently OD comes on at 60mph and lockup at 75.
Most of the hiways around here are 75 and everyone does at least 80, so my lockup is set to 5mph sooner than 80.
Below 75 lockup automatically disengages, and below 60 OD automatically disengages.
I have two switches on my shifter base to set either or both off, or in automatic mode.
In auto mode it shifts 1-2-3-OD at 60 and lockup at 75 all completely automatic.
With the switches off it shifts just like an A999 low geared first.
With my current rear gears I run 80mph at 2,100 prm and get 25mpg on the hiway with a mild built 5.9 Magnum.
An FYI, lockup will drop the RPM's about 300
And you heard correctly that a non disengaging converter clutch will kill the engine just like stopping with out pushing the clutch. (actually it feels exactly like that)
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