I’ll order it now. Is it worth having a motor driven impact driver?
you can also get them at O'Riellys, AutoZone, Harbor Freight if you have not ordered one.
I’ll order it now. Is it worth having a motor driven impact driver?
Will do!Go under and wire brush the threads. This might help with extraction. If worse case grind nut off weld new one on.
Mud retains heat, heat is an automatic transmissions enemy.
Btw, thanks for this suggestion. It worked perfectly on my remaining sill platesDo you have an impact driver?
Martin

It smelled like old coolant and thats what I was thinking. There weren't any obvious trails running down the firewall. I don't have a pressure tester but I ran the system on the Heat setting under Economy with the temp turned all the way up and it got warm. Flipped it to Normal AC setting with temp all the way up and it got warmer. Felt the lines going in and out of the heater core and they were both hot. I'll have to keep any eye on it and see if it leaks any more or if that was all old coolant. There was some sort of white pad wrapped in plastic under the insulation on that side but not on the drivers side. With the vinyl on top, I suppose its possible there wasn't enough airflow to dry it out all the way and it could have been an old leak. I doubt the heater has been run much in the last 6 months and I would have expected the upper areas of the insulation to also be wet where it met the firewall but it was just down on the lowest spot of the floor. I recall the previous owner saying he upgraded some piece of the AC system so I'm reaching out to see if it was because of a leak.Wet and sticky sounds like coolant. Maybe the heater core?