anybody? the 6 speed is the 4x4 model (what i would need). just trying to figure out if it has the standard bellhousing from chevy, dont know if there is a different bellhousing pattern for the 8.1 and duramax than there is for the other v8's such as a 454. and also dont know if the transmission (on the output side) has a different bolt pattern than the standard 6 round that gm has used since the mid 80's.