I got talking with the guy at the Allison shop while buying some TranSynd and filters. He said the last Allison 1000 rebuild they did ran about $1800. That is clutches and steels, no major parts. They also sell a rebuilt tranny to swap in for around $2010. Not too bad considering that a 4L60e rebuild can often run around $1500, and I'm sure a 4L80e is a little more. I would guess that the MTBR on the Allison would be twice or more what it is for the Hydramatic trannies also.