I have an NOS 1979 Borg Warner "PowerBrute", that I might consider selling? It is a 2.88 1st. gear. 0 miles, never in a car. The tag reads BW-AS9-T10Y. Here is some info. on them, and a link to more info.
Aftermarket for GM AS9-T10 "Power Brute" with iron case and nickel gears
Borg-Warner also sold a version of this transmission through speed shops under the "Power Brute" name. It had a 904 nodular iron case and 9310 Nickel alloy gears. The gears can be identified by a small dimple drilled into the side of each gear. Most of these version were designed primarily for drag racing and had a very low first gear. The theory at the time was to use the low first gear to launch a car quickly.
http://fiedlerh.home.att.net/BW.htm