This is cool I just cleaned up and checked the original 323 Suregrip that I pulled from the Cuda about 23 years ago.
The markings are still on it.
I also checked it and it held torque.
It has minimal backlash, and the gears look great.
I just need to replace the pinion seal If I ever want to use it.
I plan to find a creative way to remove the rust, ie Evaporust.