360 Magnum/A518?

there are two versions of this family of overdrive transmissions RE for computer and RH for hydraulic/governor controlled for this family of 518 trans//46/47/48
The 47RH was eventually replaced by the 47RE. (The 4 was the number of gears, including an overdrive; the capacity rating of 7; R for rear wheel drive; and H for hydraulic control, or E for electronic control). The primary difference appears to have been the name, since Chrysler press materials noted that even the 47RE had hydraulic shift control (other than the overdrive, which was electronically activated in both automatics).