I have a Stalker V6 (e.g. Lotus 7) kit car (Brunton Automotive, Bradenton, Florida) which has a 3.4 liter 200 hp V6. I and several other builders have run the early 5 speed without problems. The builder of the kit (Dennis Brunton) has been very sucessful Auto Crossing without transmission problems and now with a 275 hp supercharged 3.8 liter V6.
Fred