Right. So, the ALDL connector on the passenger side...jumping pins F and A will activate lock up. I have a switch between F and A to toggle on lock up, and once on, I have a vacuum switch from Superior Transmission Parts that activates the lockup based on vacuum. I also have an indicator light that tells me when the vacuum switch is engaging. The amount of vacuum is adjustable. Don't quote me but I believe I currently have it set to kick on at 10, and cut off at 12 (something like that). Seems I have it wired up pretty nifty. My only concern is that I don't "know" if lockup is actually working. I don't feel or notice rpm changes. Going back to the ALDL connector, which I have unplugged, my wiring is on the black side, as opposed to the white side. I'm not good with electrical, so I'm still trying to figure out if I'm on the right side. I'm also not sure if the lockup is thus getting activated in all gears, and even when in Park. 🤷♂️ I should also note that when I had the connector connected, I didn't notice any changes either. Some say you won't really notice but will see a slight rpm drop...which I haven't.I did not specifically include the TH350 w/the third gear lockup because it works a little differently than the two that I mentioned. In the 350 variant, only third gear locks up and there are just two wires attached to the plug that fits into the socket located on the driver's side of the case. It still uses the double terminal switch that sits on the bracket above the brake pedal but there was no VOES (Vacuum over Electric Switch) as part of that circuit. My 700R4 does have that switch, however.
Unlike the 4 spds, the 350 does not depend on internal pressure in the case for a signal to shift. The 350, even the E version and its variants, all depend on vacuum. While there are ports on the carb that do offer full time vacuum, I personally found it better to use the vacuum port on the intake, located just ahead of the timer. In the stock iteration, there is a shaped length of tubing that is attached to the vacuum module located down and just ahead of the tailshaft housing on the passenger's side of the case by a short length of rubber hose. Up at the top at the vacuum port, another short nipple of tube makes that connection.
The stock vacuum module as it comes from the factory cannot be adjusted for shift timing. There are supposedly aftermarket versions that have that ability.
Nick
My other concern is the brake switch that you mentioned. I don't recall seeing anything but will look tomorrow. I'd like to make sure that aspect works as well.