Glock your Fred thread inspired me!
This is my 06 4.8 4l60e combo in my 65 Chevy C10. I'm running 3.73 12 bolt rear end.
They are the Doug Thorley THY-324Y-C and are originally for 67-72 ls conversion trucks but I haven't had any issues on my 65 with them.
I got them here:
http://www.dougthorley.com/cartgenie...p?pid=10&cid=2
but I used a promo code which knocked like $75 or $100 off. I found the promo code on this website