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Hi Don, My name is***** will be glad to try to help. what is the transmission model number from the ID tag on the transmission?
I am guessing it would most likely be an Allison 3000 series.OL-70 means the Transmission ECU is letting you know the fluid is too cold to check the level with the keypad which is normal. If there are other faults please post those and i can look them up for you.