I had mine rebuilt by a shop in Detroit. He's actually the supplier for a ton of other trans shops in metro Detroit. He has a guy come in after hours to do the rebuilds on the side. I paid $900 (took him only the trans). The receipt says 5 pinion R planet, shift kit, vette' servo, kevlar band, beast sunshell, H.D. Z pack 8 clutch 3-4 upgrade, 2000 stall. (Hard to read writing, but this is what it says). I thought about swapping to an 80E, and still might do it when/if this one takes a ****. I've been beating on this for the past 5k ish miles with no complaints.
There is a local trans shop who charges out of the ass. Funny thing is, he gets his parts from the shop that rebuilt mine. The shop in Detroit charges $800-$900 to rebuild and beef up an 80E, while the other guy charges $1800-$2000.