only a bus trans can hold any kind of other power or even a built up vw motor.
sure you can go and get a better trans from Rancho,Folts etc but stock for stock only the 6 rib bus trans can hold anything above 200hp and even that is sketchy.
6- rib 091 used trans can go from 400-700 used and who knows what condition it's in...a built 091 from folts or racho is well over 5k easy...trust me i know!!!



