There was a guy down in New Mexico or Texas who was building a Richmond-based five or six speed transaxle that used the standard Richmond RWD trani with a quick-change gear set mounted where the tail housing would go, the lower gear splined onto a driveshaft routed through the belly of the transmission into a custom-made differential housing between the bellhousing and trans that supported Ford nine-inch gear sets, including limited slip differentials. I believe it was called the QC-850. It was fairly expensive, very hard to get, (because the engineer who designed it was a consultant to a waste management company the always had him out on the road somewhere). The one major down side was that the QC-850 was a monster. It was very long and would, in all likelihood, stick out from under the ass of your car. It was said to be very durable, capable of handling 650+ HP. I have a brochure somewhere in my reference files. If anybody's interested, I'll see if I can't dig it up. There is also a fellow in Orange California, Ron Butfoy (or was it Ray?) that designed a ZF-based six speed transaxle. Its about 3-4 Inches longer than the five-speed and the last time I was able to reach Mr. Butfoy, he was asking around $14,000.00 (!) for the brand new transaxles. I visited the shop several times, it was next to a car dealership, same side of the street, about two blocks east of Anaheim Stadium, east of the freeway interchange. It may have been a Pontiac dealership.