TH350 electrical connectors?

[Burmanater]

So a while back I nuked the second and third gears in my 84 c10. Now I'm assuming since all the plugs were there and plugged in that this is the original trans to my truck.

My question is why does a TH350 have a 4 pin connector like a 700r4 on the back above the pan on the drivers side and what is the 2 prong connector up on the passenger side towards the top just behind where the bellhousing ends?

I've never worked on anything besides this that had a TH350 with any kind of electrical wiring to it. The one I'm replacing it with doesn't have any either.

Thanks for any info, really just curious as to why they are there. Doesn't mention either of them in my Haynes manual either.