In need of a stock file for a T87 LML truck. Just purchased the truck and the file in it is locked and does not shift well at all. Tried to flash it with GM stuff today but due to it having the latest OS already, even with repair and reprogram it kept blocking out. It is OS 24274899, 3283 Trans, 6516 Diag, 6518 System. Any help would be greatly appreciated!
Thanks