makco transmission parts for automatics?
 

I do not know or endorse this retailer

but

I searched for 5L40E to get a feel for transmission parts prices after reading all of these articles on no reverse or other issues.

This site came up and they seem to have a variety of xmission parts that fit the XI GM-based automatic

http://www.makcotransmissionparts.com/5L40E-5L50E.html

Plus their prices seem very reasonable.. looks like you could piece together a complete rebuild for around $700 or less (with bands / solenoids, etc)

anyone else use them for parts or have other recommendations?