700R4 LockUp Troubleshooting

[sick472]

My K20 has the 700R4 and I cannot tell if the lock-up function is working. It's either so slight that I cannot notice it, comes in at the same time as 3rd or 4th, or it's not happening. The transmission was just rebuilt at a good shop. It happens to be an 88 or 89 model transmission.

I know it has 12 plus volts to the "A" pin at the transmission (with the motor running). The brake switch cuts that power like it should and the vacuum pod switch starts to supply that power at 4" Hg (meaning there is no power coming through it until it sees at least 4 inches of vacuum). I hooked a volt meter up this morning on the drive in to work (to the test connector) and the "A" pin 12 volts is constant from starting the engine through all gears. The only exception is when the brake is applied. The "B" pin has power to it too even though I have not been able to monitor it as the truck is moving through the gears.

Side Note: I could not get the vacuum switch to open (cut power) under a heavy foot at highway speeds like I would expect, but that should not affect it locking up, but rather effect it unlocking. 4" Hg of vacuum may be too low and my stock rebuilt motor may not drop that low, IDK.

Does anybody know at what vacuum the vac pod is supposed to activate?

Either way, I cannot seem to feel it lockup going through the gears or unlock once the brake is tapped. One curious thing I have noticed is that my test light will not light up at the test connector, but my volt meter reads 12 plus volts.

I believe I have one of the two posted wiring diagrams. I'm not sure what to look for regarding the EGR Bleed Solenoid, but other than that the diagrams fit my system. And, I'm not sure which diagram is correct for inside the transmission itself.

Any tips on what to do next?

I will be consulting my transmission shop, but thought about checking here first. Thanks in advance!