Welcome to iRV2
Are you by any chance referring to a 3060 series Allison ?
Do have the push button shift pad and you're retrieving codes from it ?
Any idea of the age of the transmission and what control system you have?
WTEC II; III or IV ( World Transmission Electronic Controls )?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.