It`s been a few months since you last posted on your project, but at -1deg I wouldn`t work on mine either. 50 is too cold for me around here at times.
Good you got her up and running, it is a different car isn`t it? I remember the excitement when I finally got her to move the first time. WOW! thought I was in a Corvette

. I guess it is the 2:88 Diff., reverse is almost faster than first gear.
now Iam wondering which rod I used in the master cyl. I do know the peddle seems too close to the floor for engagement. and the pita the master is to work on under the dash............nah, no way Iam messing with it now. the bleeding was bad enough.
too bad about the trans problem. $200 for one already pulled is not a bad price. PNP charges $149 out the door total cost, and I pull it. that adsitco is a bit pricy I would think.
there is a thread about them, and to stay away, customer svc sucks. do a search on them. But some people have had good luck with them.
At least now you will have a trans to take apart and maybe replace the bearings to have a good spare. another learning curve. the haynes manual shows the iron box disassembled as a good guide.
A couple months back I sent the driveline back to the shop and had the U-joint replaced. had a vibration that I have been trying to work out. thought I didn`t have the FW balanced right, maybe wrong trans rubber mount, maybe some angle off

. even wiggled and moved the DL. then one day checked the center bearing/U-jount again and detected some movement in the joint. so much for my low milage DL from PNP

. But did drive it a year before this showed up.
I just replaced the sub frame and trailing arm bushings and swaped in lower milage trailing arms and lower milage Diff., and as soon as I get the new parking brakes installed and exhaust back on, I hope nothing shakes rattles or vibrates

. Iam at 361k so some of this was due for a up grade.
enjoy your car this summer, Iam sure you will.
Charlie .............. Wow, Iam at 3000 posts...............