So, one thing I think I'd like to fix on the car is the rear end. I understand the current rear didn't come with the car. I'm still learning so bear with me. I understand this is a 1966 rear but not the correct one for a Shelby. Mine came originally with a detroit locker if that makes a difference. The story goes that when my car was imported back to the US with a 65 Shelby the rears were swapped when both were restored simultaneously. The 65 has a 66 rear as well but it currently has overriders on it. I have the original metal tag that came with my rear.
Could you please confirm this rear didn't come with my car?
Are the rear ends date coded?
Is there an external indication that the rear is a detroit locker?
You have gotten some good information on the styles of housings. There are instances of the '65 style being installed in '66 cars, but the cars are usually earlier production times than yours.
You and I have talked about the tag, but here it is for the others.
3L89=3.89 ratio with Detroit Locker
6=1966
B=Feb
D=4th week (Feb in this case)
Pretty cool to see a Detroit Locker in a '66. It's pretty unusual.