Can’t seem to ID this trans and valve body

According to the number, it does not appear to be the original transmission for 1991 model year. The date 1148 is February 4, 1992. 53008144 was used in 1992 vans and pickups. It is listed as A998, with long extension, with 3.9 liter engine, high stall, with electronic lock-up torque converter.