LB7: 2003 Stock LB7 Files

[EFI Support]

File name represents:
YEAR_ENG_(OS ID)_TRANS type

2003_LB7_(15189044)_ALI.tun - 2003 CHEVROLET K2500HD SILVERADO
2003_LB7_(15189044)_ALI_b.tun - 2003 CHEVROLET K2500HD SILVERADO

 

[GMAX79]

What's the difference between the two transmission of the stock tunes that you posted? I need a stock tune for my truck. Thanks