I am posting this to help understand the difference in 4L60-E transmission year of manufacture Technical issues that may be encountered if swapping between years. (using any 4L60-E because it LQQKS the same). My journey led me here because, Nov of 22 while driving . . . My van,2005 Astro, 4.3L, base...

Tried to go to www.gmtechbooks.com/ but I get handed off to https://www.crateenginedepot.com/.
Tried different browsers with same results.
I was hoping to learn more about trannies.