Hi hidollartoys: Thank you for the reply, but what is correct - I should not worry about the floor or there is a better repair method than concrete slurry.
Thank you.
My 4" concrete two car garage floor was poured in 1978 and has no cracks. I believe the concrete was reinforced with whatever type of metal mesh was used back then. When replacing the concrete driveway, the area where the driveway meets the garage floor showed there were areas under the garage...