Just as a point to ponder, the A518 came in non-lockup and lockup converter configurations, with a governor (no computer required), while the later version is known as the 46RE, which is partially computer controlled, and lock-up converter only.

The A618, and later 47RE and 48RE, came behind the Cummins Diesel and V10 only. I am not sure about the V10, but I know that the Diesel version bellhousing bolt pattern is different from the usual smallblock bolt pattern, and the torque converter is a massive 13" unit. The A518 family use an 11" converter basically the same as older 727s used. The lockup clutch in the 11" converter is barely adequate behind a 360 in a pickup or van, so I would recommend the non-lockup variety for your Hemi.

Since you must use an adapter plate anyway, going to the GM 4L80-E may be a better option, both from the available parts and that it should fit the floorpan more readily than the Mopar unit. Also, there are aftermarket lockup torque converters for the 4L80E in various sizes and stall speeds available, as well as stand-alone transmission controllers with wiring harness for the 4L80-E. This stuff is rather pricey, however.

And another option is the Ford AOD, as modified by several aftermarket companies. It definitely will fit your floorpan without serious mods, and some companies claim capacity improvements to 1000HP.

Regardless, having to use an adapter plate allows you to choose the best transmission for your use, regardless of brand.

Or, you could buy a lot of gas for the money invested in converting to overdrive...

440shorty