Jewmont3

So does the 8.1L 496 it fit up to the T56? I know the 4L80e fits up to the LS motors and it comes standard on the 8.1L so does that mean it will bolt up to the T56 or is there a special bellhousing I am not hearing about? Or does the 8.1 come with the allison?

thanks,
Mike

rollinna65

iTrader: (18)

I'm pretty sure 8.1L is an old school big block so the LT1 T56 will probably bolt up.

67RSCamaroVette

iTrader: (63)

pretty sure the allison (GM version) six speed only comes on duramax diesels.

FastKat

iTrader: (10)

Well if it helps any, I took a T56 off of a 99 LS1 Z28 and replaced it with a 4L80E from a 2003 chevy 2500HD series van. No problems, it mounted up fine. As long as they didn't change the bolt pattern on the 4L80E's, it should work.