42RH advice needed

I think I am on the home straight with my upgrade from 727 to 42RH but could still use a little advice. Overdrive seems to be working fine but I'm not sure about lockup. All seems pretty smooth with no juddering.

I have separate relays for overdrive and lockup operation through pressure and vacuum switches. I have wired indicator lights up so that I can tell when these are grounding the two circuits as I found that delay in operation was making it difficult to set the pressures.

Part of the problem is that I haven't driven a vehicle with one of these transmissions so I don't know what to expect.

I see a significant drop in revs when overdrive comes on but not when the lockup light comes on. Are there any simple checks I should run with the car at rest? Should I be able to hear the LU solenoid click if I ground the rear wire with the car on the ramp? Anything else I should look for?

Also, when speed drops enough for overdrive to disengage and I'm on light throttle I don't see any drop in revs but next time I put my foot on the gas the revs pick back up so it's obvious overdrive has disengaged at this point. Is this normal? I am used to old manual transmissions with Laycock overdrives that jump out as soon as the power is removed from the solenoid.

How long should it take from grounding the overdrive solenoid to overdrive coming in and should it come in with a positive clunk or a smooth flow?

Thank you for your help.