i looked up a trans online for 2008 silverado 2500 hd,,me not knowing that they did away with the 4l80e in 07'classic was the last year...when i was ordering parts for a 2008 2500 hd at the dealership the salesman kept telling me they didnt show a 2008+4l80e...thats when i found out...im gonne keep doing research on this...if not i know some willing to trade for a 80e.