Questions: Fluids and Wiring

I will chime in on the Trans oil.

USE ONLY THE FACTORY SPEC'D OIL. USE ONLY THE FACTORY SPEC'D OIL. USE ONLY THE FACTORY SPEC'D OIL.

Using any other spec WILL damage the fiber backings used inside, and will also attack the yellow metals used as well. I did a lot of research on this because I read a lot of complaints as to why Mopar specs such an expensive oil for the T56. Plenty of people tell stories about how they used the cheaper stuff and havent had any issues. In their ignorance, they say this having never taken one apart for service. All they know is it worked for them. Damage is there, they just dont know it. As expensive as these transmissions are, I choose not to skimp. Save $50 now, just to pay thousands in repair later. No thank you.

From what I had read on some oil forums, the GM synchromesh is the same stuff- IIRC.
Verify this on your own because my memory is not what it used to be...
My local Dodge dealer had what I needed on hand so I didnt have to resort to the GM stuff.

Here is a helpful tip for you on filling the trans with oil. Pull the shifter out and fill it from there. Getting oil in the normal fill hole is damn near impossible when its in the car. Just make sure you have the driveshaft or a yoke installed or you will find a really expensive puddle of oil underneath the car as it takes the path of least resistance out your tailshaft. Yes, I found out the hard way... Luckily only after most of the first quart.