Thread: 4r100

I have a 99 lightning that is holding a gear the transmission is holding gears when i floor it im also getting a speed sensor code but my speedometer works my question is are theyre two speed sensors one i dont know about or has anyone heard of any crap like this im thinking its the crappy tune that the truck has had since i had recently bought it. If anyone has any insight on my situation im all ears thanks

Found my issue its an ecu issue will ne replacing it next monday will have details then